Why Switch to a Digital SIM for International Trips
The Best eSIM for Travel: My Honest Guide for 2025
You land in a new country, and your phone immediately connects to a local network because you installed a best eSIM for travel before your flight. This digital SIM card replaces the need for a physical plastic card, allowing you to activate a data plan from a global provider directly on your device. Its primary benefits are instant activation upon arrival, avoiding expensive roaming fees, and the ability to switch between regional or global plans without visiting a store.
Why Switch to a Digital SIM for International Trips
Switching to a digital SIM for international trips eliminates the hassle of hunting for physical SIM cards upon arrival. The best esim for travel provides instant connectivity the moment you land, avoiding roaming fees and time wasted at airport kiosks. You can purchase and activate a data plan before your flight, ensuring you have maps and translation tools ready. Why switch to a digital SIM for international trips becomes clear when you need to keep your home number active while using a local data profile. This dual-SIM functionality lets you manage work and personal calls without swapping physical cards. Digital SIMs also eliminate the risk of losing or damaging a tiny physical card, and you can top up or change plans remotely if your needs change mid-trip.
Eliminating physical SIM swaps and roaming fees
Switching to a travel eSIM eliminates the physical hassle of swapping SIM cards at every border and the risk of losing your primary card. You purchase and activate a digital plan entirely through an app, keeping your home number active in a separate eSIM profile. This directly removes steep roaming fees, as you buy local or regional data bundles at local rates instead of paying your home carrier’s daily roaming charges. There is no physical card to manage, no wait at airport kiosks, and no surprise bill for using maps or messaging while abroad. The result is one consistent data connection from landing to departure without manual hardware changes.
How eSIMs simplify connecting across borders
eSIMs eliminate the need to swap physical SIM cards at Japan eSIM each border, allowing instant local network access upon landing. Instead of hunting for a vendor or managing multiple tiny cards, you simply download a new data plan in minutes. Cross-border connectivity becomes a seamless process where you activate a regional plan covering multiple countries before departure. This removes the risk of losing your home SIM and avoids time wasted at foreign airports. The logical sequence is straightforward:
- Purchase a regional eSIM plan online before your trip.
- Scan a QR code or install the profile on your phone.
- Power on upon arrival and automatically connect to a local carrier.
You remain reachable across borders without any manual intervention, making transitions between countries nearly invisible.
Instant activation vs. traditional carrier contracts
Traditional carrier contracts require signing a multi-year term, paying early termination fees, and often involve a lengthy in-store process to unlock a phone before you can use a local SIM abroad. In contrast, a digital SIM offers instant activation for travel. You purchase and download an eSIM online while still at home, and it activates within minutes upon arrival. The process follows a clear sequence:
- Buy a travel eSIM plan from a provider’s website or app.
- Download the profile to your device via a QR code or manual setup.
- Switch on cellular data upon landing—no store visit or contract required.
Top Factors to Consider When Choosing a Travel SIM
When selecting the best eSIM for travel, the coverage area is paramount—ensure the network includes all your destinations without dead zones. The data allowance must match your usage, with unlimited or high-capacity plans critical for streaming or heavy navigation. Evaluate speed and throttling policies, as some providers cap performance after a threshold. Ease of activation is vital; look for apps or QR codes that work instantly without local verification. Pricing transparency matters—avoid hidden fees for tethering or top-ups. Finally, check validity periods to align with your trip length, and confirm customer support availability for real-time troubleshooting abroad.
Coverage networks and local carrier partnerships
A travel eSIM’s value hinges on its local carrier partnerships, which determine whether you connect to a primary network or a less reliable roaming partner. In a specific destination, an eSIM linking to a Tier-1 local operator (e.g., Telstra in Australia) offers superior rural and indoor coverage versus a budget eSIM using a secondary MVNO. Check each eSIM provider’s partner list: single-carrier eSIMs provide consistent 4G/5G access, while multi-carrier networks automatically switch to the strongest local signal, crucial in areas with fragmented coverage like train corridors or mountainous terrain.
| Coverage Model | Local Partnership Benefit | User Impact |
|---|---|---|
| Single Local Carrier | Direct access to one top-tier operator | Reliable in that operator’s coverage zone |
| Multi-Carrier Network | Roams across multiple local partners | Dynamic fallback if one network is weak |
Data allowances versus pay-as-you-go flexibility
When choosing a travel eSIM, the core tension is between predictable data allowances versus pay-as-you-go flexibility. A fixed data plan works if you plan to stream or navigate heavily, offering a set bucket for a set price. However, for varied habits, a pay-as-you-go model is superior. It lets you top up only when you run low, preventing waste on unused gigabytes. You might buy a small base allowance, then add data in real-time via an app if you need more, ensuring you never overpay for idle days in a café. This flexibility is ideal for trips with fluctuating connectivity needs.
Pricing transparency and hidden charges to avoid
Always check the fine print for hidden activation fees that aren’t included in the upfront plan price. Some eSIMs lure you with a low data tariff, then slap on a tiny connection charge every time you top up. Watch for “fair usage” caps that throttle speeds without refunding you, or expiry dates that burn your credit if you don’t use it within days. A plan that seems cheap often buries its real cost in sneaky per-MB overage rates. Stick with providers that show the total cost—taxes and roaming fees included—before you buy.
To avoid pricing traps, always confirm the final checkout total includes all taxes and connection fees, and never assume a low headline price covers your full trip.
Compatibility with unlocked and carrier-locked phones
For global travel eSIMs, your phone must be unlocked by your carrier; a locked device restricts the eSIM slot to its original network, preventing any third-party data plan from activating. If your phone is unlocked, compatibility hinges on the eSIM’s frequency bands matching your device’s modem and the destination’s infrastructure—a recent flagship generally works, but older models may lack necessary bands. Conversely, a carrier-locked phone typically renders eSIM travel plans unusable, though some carriers offer temporary unlocks. Always confirm your phone’s IMEI with the eSIM provider before purchase to avoid activation failures.
Leading Global Provider Options for Frequent Travelers
For frequent travelers, leading global provider options like Airalo and Holafly offer practical advantages. Airalo’s data-only regional eSIMs let you switch between countries on a single plan, ideal for multi-stop trips. Holafly provides unlimited data plans, perfect for heavy data users who avoid throttling. Both integrate seamlessly with your phone’s eSIM slot, eliminating physical SIM swaps. Airalo stands out for granular country selection, while Holafly’s fixed US $50/month global plan offers predictable costs. For the best eSIM for travel, these providers ensure instant activation after purchase, so you’re connected as soon as you land. They support major destinations and offer 24/7 chat support, keeping your workflow or navigation fluid without roaming fees.
Airalo: regional plans and multi-country passes
For frequent travelers, Airalo’s regional plans and multi-country passes offer an unmatched convenience, covering entire continents like Asia, Europe, or the Americas with a single eSIM purchase. Instead of juggling multiple local SIMs, you activate one pass and seamlessly connect across borders, from hopping between Paris, Rome, and Berlin on a global plan to navigating Southeast Asia’s major hubs. These passes pool high-speed data allowances, ensuring you stay productive and connected without hunting for local providers. For instance, a regional Asia plan lets you work from a Tokyo café, then instantly share photos from a Bali beach. This streamlined approach saves time and eliminates billing surprises, making Airalo the definitive choice for travelers crossing multiple countries.
Holafly: unlimited data packages and user experience
Holafly stands out by offering genuine unlimited data packages for travelers, a decisive advantage over capped plans that throttle speed after a fixed limit. The user experience is streamlined: you activate the eSIM via a QR code before departure, and data runs on reliable local networks immediately upon arrival. No SIM swaps or searching for Wi-Fi are needed. Their app provides transparent dashboard tracking, and 24/7 support resolves setup hiccups quickly. While video streaming may slow after a daily fair-use threshold, for navigation, messaging, and social media, Holafly’s unlimited high-speed access remains consistently smooth and frustration-free across dozens of countries.
Ubigi: competitive rates for specific regions
For frequent travelers, Ubigi delivers a standout advantage by offering hyper-localized data pricing that undercuts major global providers. Instead of a one-size-fits-all plan, their competitive rates for specific regions—like dedicated Japan or Asia-Pacific packages—mean you only pay for the coverage you actually need. This targeted pricing often slashes costs by half when roaming in high-demand zones like Southeast Asia or Western Europe, making it a top pick for budget-conscious nomads.
- Japan-specific plans provide some of the lowest per-GB costs available for that region.
- Asia-Pacific bundles offer sharp discounts compared to universal global eSIMs.
- European regional passes frequently beat single-country roaming rates from larger networks.
- North American data packs are priced aggressively against standard tourist SIMs.
Nomad eSIM: flexible durations and rollover data
For frequent travelers selecting the best eSIM for travel, Nomad eSIM’s flexible durations and rollover data are key practical features. Plans range from 1 to 365 days, allowing precise alignment with trip length without paying for unused days. Critically, any unused data from a current plan automatically rolls over when you purchase a new top-up within the same region before the existing plan expires, preventing waste. Data duration is reset from the new plan’s start date, ensuring no loss of service continuity. This avoids the common frustration of rigid monthly cycles with forfeited gigabytes, making Nomad ideal for unpredictable or multi-stop itineraries.
Specialized Solutions for Specific Destinations
For the best eSIM for travel, specialized solutions for specific destinations unlock seamless connectivity by ditching one-size-fits-all plans. Instead of paying a premium for global roaming, you can snap up a local data pack tailored exactly to Japan’s lightning-fast networks or a multi-country plan for a whirlwind European tour. These destination-focused passes often provide massive data allowances at a fraction of standard roaming costs, and they connect you to the strongest local carriers automatically. Whether you need uninterrupted maps across Bali’s coastline or instant uploads from a Paris café, choosing a specialized regional eSIM ensures every megabyte counts directly for your itinerary, not wasted on global overheads. It’s the smart traveler’s shortcut to lag-free exploration.
Asia-focused carriers like Japan’s Holafly or China’s local networks
For seamless connectivity in Japan or China, Asia-focused carriers like Holafly or local Chinese networks are the definitive choice. These providers eliminate the complexity of navigating regional compatibility, offering pre-configured specialized Asia eSIM profiles that connect instantly to local towers—Docomo in Japan or China Mobile in China—for optimized speeds. You bypass expensive roaming and avoid VPN hassles for restricted services. Q: Can I use social media in China with these eSIMs? A: Yes, carriers like Holafly often include a domestic VPN within their China data packages, letting you access Google, Instagram, and WhatsApp without extra configuration.
Europe-wide plans from providers such as Orange Travel
If you’re hopping between multiple European countries, Europe-wide plans from providers such as Orange Travel are a super convenient pick. These regional eSIM data packages let you activate coverage in dozens of destinations from a single purchase, so no shuffling between separate local SIMs. Plans often bundle 10GB to 50GB of high-speed data valid for 14 or 30 days, and you can top up directly from the app. Just double-check that your specific destinations—like Croatia or Norway—fall within the included zone, as coverage varies slightly by plan. It’s a one-and-done setup for smoother travel across the continent.
North America prepaid offerings and cross-border compatibility
For travelers crisscrossing the United States, Canada, and Mexico, cross-border eSIM compatibility is essential. Leading North America prepaid offerings now bundle a single data pool that works seamlessly across all three countries, eliminating the need to swap profiles at the border. Carriers like Airalo and Holafly provide multi-gigabyte packages explicitly for this region, with instant top-ups available via app. However, ensure your plan explicitly lists all three nations, as some cheaper offerings restrict high-speed data to just the U.S. and Canada. For reliable connectivity from Toronto to Tijuana, these prepaid regional eSIMs outperform dormancy-prone international roaming add-ons.
South America and Africa niche providers with strong coverage
For travelers prioritizing reliable regional connectivity, niche eSIM providers like Holafly and Airalo offer robust coverage across South America’s Andean nations and Africa’s sub-Saharan hubs. These carriers leverage local networks—such as Claro and TIM in Brazil, or MTN and Vodacom in South Africa—ensuring stable 4G/5G speeds in major cities like Buenos Aires and Nairobi. Unlike global plans, their destination-specific data pools avoid throttling and provide direct routing, reducing latency for navigation and messaging.
- Peru’s remote Machu Picchu area maintains connectivity via regional partners like Bitel
- Kenya’s Maasai Mara safari zones receive strong coverage through Safaricom agreements
- Chile’s Patagonian routes stay connected thanks to Entel’s dedicated roaming profiles
- Nigeria’s Lagos economic corridors benefit from localized Airtel data bundles
How to Maximize Savings on Your Trip’s Connectivity
To maximize savings on your trip’s connectivity, select a travel eSIM with regional or global data packages rather than individual country plans, as these often reduce per-GB costs significantly. Purchase your eSIM before departure to lock in promotional rates, and opt for a data-only plan to avoid high per-minute calling fees—use VoIP apps instead. Monitor your usage through the provider’s app to avoid unnecessary top-ups, and leverage bundled multi-GB plans for longer stays.
For the best ROI, pair a low-cost “light” eSIM for navigation and messaging with local Wi-Fi for heavy downloads, ensuring you never overpay for idle data.
Comparing per-gigabyte costs across provider tiers
When hunting for the best esim for travel, don’t just glance at the total plan price—zoom in on the per-gigabyte cost across provider tiers. A 10 GB plan from a budget tier may look cheap upfront, but its cost per GB often spikes compared to a mid-tier 20 GB offer, which slashes your rate by nearly half. Conversely, premium tiers with unlimited data usually inflate the per-GB price dramatically after a soft cap, making them terrible value for light users. Decoding per-gigabyte costs across provider tiers reveals that a 5 GB or 10 GB mid-tier option almost always delivers the lowest price per megabyte, letting you stretch your travel budget further without paying for unused buffer.
Leveraging referral codes and first-time purchase discounts
To slash connectivity costs, actively hunt for exclusive eSIM referral codes before you buy. First, use a friend’s link to get an instant discount on your initial data plan, often slashing the price by 10–20%. Next, after activation, share your own personalized code with travel buddies. For every successful sign-up, you typically earn credit toward your next top-up. Finally, stack this with a first-time purchase offer—many providers give a separate welcome coupon code. Simply apply it at checkout to double your savings:
- Search for an active referral code from a fellow traveler.
- Apply the code during your first plan purchase.
- Share your unique code post-purchase to bank future credits.
Group plans and shared data pools for families
For families traveling together, shared data pools for families slash costs by letting everyone draw from one bucket of gigabytes. Instead of buying separate eSIMs for each person, you add multiple lines under one group plan. This means you only pay for the data you actually use as a crew, avoiding wasted money on unused individual allowances. Great for keeping kids online for maps or streaming without surprise top-ups.
How do I split data between phones on a shared family eSIM plan? Most providers let you set alerts or cap usage per line directly in the app, so one person doesn’t hog the pool—super handy for road trips where everyone’s needs differ.
Bundle options that include voice minutes and SMS
For travelers needing to confirm bookings or send quick texts, bundles with voice minutes and SMS bridge the gap between pure data and full local service. Providers like Airalo rarely include calls, so opt for Holafly’s regional packs or a global eSIM from BNESIM, which tack on 60–100 minutes and unlimited SMS with your data allowance. *This combo eliminates surprise roaming fees for two-factor authentication calls or ride-share confirmations.* Q: Can I buy a voice+SMS bundle for just a few days? A: Yes, most offer 3–7 day packs, ideal for short trips. Prioritize providers that let you top up minutes separately if your main eSIM is data-only.
Installation and Setup Tips for First-Time Users
When choosing the best esim for travel, installation and setup tips for first-time users are crucial for a seamless experience. Begin by ensuring your phone is unlocked and compatible; then, purchase your plan from a reputable provider before departure. Upon arrival, scan the QR code in a stable Wi-Fi zone—not mid-transit. Manually add the APN if data doesn’t activate instantly. Always disable your primary home SIM to avoid roaming charges after setup. Test your connection by reloading a map, and save the confirmation email with your QR code as a backup. Follow these exact steps to stay online immediately.
Checking device compatibility before departure
Before purchasing any eSIM, you must first confirm your device is unlocked and eSIM-compatible. Check your phone’s settings for an “Add Cellular Plan” option or use the manufacturer’s IMEI checker. Forgetting this step risks a non-functional plan upon arrival. **Verifying device compatibility before departure** is non-negotiable for a seamless connection. Many travelers discover too late that a region-locked phone or obsolete model blocks eSIM activation. Always confirm eSIM readiness on your carrier’s support site or via your device specifications.
Q: How do I verify my phone supports travel eSIMs?
A: Go to Settings > Cellular or Mobile Data; if you see “Add eSIM,” your phone is compatible. Alternatively, dial *#06# to find your EID number—its presence guarantees eSIM support.
Downloading and activating eSIM profiles ahead of travel
To ensure instant connectivity at your destination, always download and activate your eSIM profile before departure, while you still have reliable Wi-Fi. This prevents data hiccups upon landing. Most providers email a QR code or a direct install link; open this in a stable connection and follow the on-screen prompts. After installation, label the profile clearly in your phone’s settings (e.g., “Spain Travel”) and ensure it is enabled for cellular data. Then, disable your primary home line to avoid accidental roaming charges.
- Verify your device is unlocked before purchasing an eSIM.
- Perform the install on Wi-Fi to avoid mobile data failure.
- Test the activation by toggling Airplane Mode on/off while still at home.
Managing dual SIM settings for home and travel lines
When setting up your device for travel, managing dual SIM settings ensures your home line stays active while using your travel eSIM. First, assign your home SIM for voice calls and SMS by default, then set the travel eSIM as the primary for mobile data. Label each line clearly (e.g., “Home” and “Travel”) in the device’s SIM management menu to avoid confusion. Next, configure call forwarding from your home number to a voicemail service if you want to avoid roaming charges, or keep it inactive. For a clear sequence:
- Navigate to Settings > Cellular or Mobile Data.
- Select your home line and set it as the default for voice and iMessage/FaceTime.
- Choose the travel eSIM as the data line under “Cellular Data” or “Mobile Data” options.
- Turn off data roaming for the home line to prevent accidental charges.
Troubleshooting common activation errors
When activating a travel eSIM, a common error is the “No Service” message, which typically resolves after manually selecting the correct network via your device’s settings. An “Invalid SIM” error often means the QR code was scanned incorrectly; delete the eSIM profile and re-scan using a stable Wi-Fi connection. If activation fails after purchase, ensure your phone is unlocked and eSIM-compatible, as carrier locks or outdated iOS/Android versions frequently block provisioning. For persistent “Activation Pending” errors, rebooting your device or toggling airplane mode on/off can force the profile to finalize installation.
Most activation errors stem from unlocked device requirements, incorrect manual network selection, or a corrupted QR scan. Rebooting or reinstalling the profile generally resolves these issues.
Red Flags and Pitfalls to Watch For
A key red flag is an eSIM provider offering unlimited data at suspiciously low prices; this often masks severe throttling after a gigabyte or two, rendering your map app useless. Watch for pitfalls like confusing activation steps that require scanning a QR code with a different device than your primary phone. Even reputable brands can sting you with data-only plans that lack a local phone number, which you’ll desperately need for two-factor authentication or ride-hailing apps. Another trap is a plan that starts counting days from purchase, not first use—if you buy a 30-day plan a week early, you’ve already burned seven days. Always verify the precise coverage map for your destination countries, as “global” often excludes specific regions or networks. Finally, read the privacy policy carefully; some budget eSIMs profit by selling your browsing history to data brokers.
Fair usage policies that throttle speeds
When hunting for the best esim for travel, always check the fine print for fair usage policies that throttle speeds. These sneaky caps might promise “unlimited data,” but your connection can slow to a crawl after using a specific amount, like 500MB per day. That’s useless for video calls or quick social media uploads. Look for plans that clearly state their speed limits after the threshold, not just vague “fair use” warnings. Avoid these pitfalls by scanning user reviews for real complaints about throttling, and pick a provider that either offers a high cap or doesn’t throttle at all.
Expiration dates and unclaimed data rollover
A critical red flag when choosing the best eSIM for travel is the interplay between expiration dates and unclaimed data rollover. Many providers market “rollover data” but impose a hard activation window; if you do not activate the plan within 30 days of purchase, the entire rollover balance is forfeited. Even with rollover, the carrier typically resets the expiration date to the original plan’s end—so unused data from month one does not extend month two. Do you lose all my unclaimed data if the plan expires mid-trip? Yes, most eSIM vendors delete any unused rollover data the moment the main plan reaches its expiration date, regardless of how much you banked. Always check whether rollover data has its own separate expiry or is tied to the active plan’s lifecycle.
Inadequate customer support during emergencies
During a travel emergency, unresponsive eSIM customer support can escalate a simple connectivity fix into a critical safety risk. If your eSIM fails at a border crossing or your data depletes in a remote area, a provider with only email ticketing or chatbots leaves you stranded. Avoid any eSIM brand lacking a 24/7 live chat or phone line that resolves issues in minutes. Prioritize providers known for instant escalation of urgent cases, such as lost activation codes or network roaming failures, to ensure you can always reach help when it matters most.
Hidden roaming charges on secondary networks
When an eSIM switches to a secondary, fallback network, many travelers unknowingly trigger exorbitant roaming rates. These hidden charges appear because the secondary provider lacks a direct billing agreement with the local carrier, instead routing data through an expensive third-party hub. To avoid this, check if your eSIM explicitly lists all partner networks and confirms that non-preferred network usage carries the same flat-rate pricing. A plan that seems cheap can double its cost during brief, automatic network swaps.
Hidden roaming charges on secondary networks occur when an eSIM’s fallback carrier applies separate, higher rates, instantly inflating travel expenses without clear upfront notification.
Real-World Comparisons: Speed Tests and Reliability
Real-world speed tests consistently show that Airalo provides reliable, steady LTE for browsing and messaging, while Holafly often delivers faster peak speeds on 5G networks, particularly in urban centers. For reliability, Airalo’s connection is more consistent across varied terrains, making it better for rural travel; Holafly’s performance can dip in remote areas. A traveler’s device and local tower congestion will sway results more than the eSIM provider’s advertised network. Choose Airalo for consistent, low-drama connectivity over a long trip, and pick Holafly if you prioritize maximum speed in cities. Your choice should hinge on whether you value predictable performance over sporadic peak throughput.
Urban vs. rural network performance differences
When selecting the best eSIM for travel, urban network performance is consistently robust across providers, offering high-speed data for streaming and navigation. Rural performance, however, exposes significant disparities, with some eSIMs prioritizing coverage on major roads while leaving countryside corridors with throttled speeds or no signal. For travelers venturing beyond cities, rural network reliability becomes the critical differentiator. eSIMs leveraging primary local carriers like Telefónica in Spain or T-Mobile in the US generally maintain better download speeds in remote areas than those relying on budget MVNOs. Always verify that an eSIM’s coverage map includes rural zones, not just urban hubs.
Urban speeds are uniformly high, but rural performance varies drastically—choose an eSIM with strong local carrier partnerships for consistent connectivity outside city centers.
Latency issues for video calls and streaming
For travelers, low latency for video calls and streaming is a critical differentiator among eSIMs. While speed handles file size, latency dictates real-time interactivity. High latency (above 150ms) causes noticeable lag, making conversations stutter and live sports unwatchable. When comparing eSIMs, prioritize those connecting to core networks over third-party aggregators, as direct peering reduces round-trip delays. To test before committing:
- Run a ping test (aim for under 100ms) on a short-term eSIM trial.
- Join a quick video call to feel the delay in turn-taking.
- Stream a live event; check if picture quality drops or if audio desyncs during active moments.
An eSIM with consistent sub-100ms latency ensures smooth, natural conversation and buffer-free streaming abroad.
User reviews and ratings on app stores
User reviews and app store ratings offer raw, unfiltered data on how eSIMs perform in the real world. Travelers frequently highlight app store speed test ratings, noting where a provider’s advertised speeds falter during peak hours in crowded cities. A four-star average might mask complaints about sudden throttling on video calls. Pay special attention to recent reviews, as network partnerships and performance can shift rapidly. Sorting by “Most Recent” reveals current consensus on reliability, often showing a split between flawless data in tourist hubs and frustrating drops in rural zones. These direct accounts from fellow roamers are more trustworthy than marketing claims.
Duration of connectivity after data exhaustion
When evaluating the best eSIM for travel after data exhaustion, the duration of connectivity varies significantly by provider. Some instantly cut off data access, requiring an immediate top-up via app, while others offer a throttled 2G/3G connection for a limited period, often 24–48 hours, after the high-speed quota is depleted. A few premium plans include a “safety net” grace period of up to one hour for emergency usage. This throttled window is rarely sufficient for video streaming but can keep messaging apps alive. Below are practical realities of post-exhaustion connectivity:
- Average grace period for throttled data: 0 to 48 hours, depending on the eSIM provider.
- Immediate cutoffs require manual top-up to restore any data connection.
- Limited eSIMs allow low-speed browsing (e.g., 128 kbps) for the remainder of the validity period.
- Emergency 911/SOS often remains accessible even after full data exhaustion.
