Every eSIM sold to travelers is technically prepaid: you pay upfront, get a fixed amount of data, and the plan expires after a set number of days. There are no contracts, no monthly bills, and no cancellation fees. But prepaid eSIM providers differ significantly in how they handle top-ups, data expiry, unused data, and what happens when your balance hits zero. We bought prepaid plans from every major provider and tracked how each one behaves when data runs low, when plans expire, and when you need more. Here are the five prepaid eSIM providers that handle these scenarios best.
Which providers are best for this use case?
| Rank | Provider | Best For | Why |
|---|---|---|---|
| #1 | Airalo | Best overall prepaid eSIM | 200+ countries, plans from $4.50/1GB for 7 days to $26/10GB for 30 days. Airalo's in-app top-up lets you add data to an active plan without scanning a new QR code. Clear data usage tracking shows exactly how much you have left, and unused data stays valid until the plan period ends. |
| #2 | Helloroam | Best value prepaid plans | 180 countries at $3.99/1GB for 7 days and $19.99/10GB for 30 days. HelloRoam's prepaid pricing consistently undercuts Airalo by 10 to 20% on matching data tiers. Flexible durations (7, 15, and 30 days) mean you only pay for the time you need. Top-ups are supported through the app. |
| #3 | Nomad | Cheapest prepaid plans | 120 countries with the lowest entry price at $3.00/1GB for 7 days. Nomad strips away extras to deliver rock-bottom pricing: $8/3GB, $12/5GB, $20/10GB for 30 days. No top-up feature means you buy a new plan if you run out, but for budget travelers on short trips, the savings are real. |
| #4 | Saily | Privacy-first prepaid | 150 countries at $3.49/1GB for 7 days. Saily, backed by NordVPN, adds zero-logging and encrypted connections to the standard prepaid model. Plans run $8.49/3GB and $18.99/10GB for 30 days. VPN bundle discounts drop the effective cost further if you already subscribe to NordVPN. |
| #5 | Simly | Simple prepaid with easy top-ups | 125 countries at $2.99/1GB for 7 days. Simly matches Nomad on base pricing and adds top-up support so you can extend your plan without starting over. Plans at $7.99/3GB and $11.99/5GB for 30 days make them one of the most affordable options with top-up flexibility. |
How does a prepaid eSIM work?
A prepaid eSIM works exactly like a prepaid physical SIM card, except there is no plastic card. You purchase a plan online, receive a QR code via email or in the provider's app, scan the QR code with your phone's camera, and the eSIM profile installs directly onto your device. The entire process takes under 5 minutes from purchase to activation. Once installed, the eSIM sits dormant until you arrive at your destination and your phone connects to a partner network. At that point, your plan timer starts counting down. A 7-day plan gives you 7 calendar days from first connection, not 7 days of active use. A 1GB/7-day plan from Airalo means you get 1GB of data that expires 7 days after your first connection in the destination country. Your phone can hold multiple eSIM profiles simultaneously. Most iPhones (XR and later) support 8 or more stored eSIM profiles, though only one or two can be active at the same time. This means you can pre-load eSIM plans for multiple countries before a multi-stop trip and switch between them as needed. Payment is a one-time charge. You will never receive a recurring bill. Airalo accepts credit cards, PayPal, and Alipay. HelloRoam takes credit cards and Apple Pay. Nomad accepts credit cards and Google Pay. No provider we tested requires a deposit or credit check. The prepaid model is genuinely simple: pay once, use your data, and the plan disappears when it expires or when you delete it from your phone.
What happens when your prepaid data runs out?
When your data allocation hits zero, your internet connection stops immediately. You will not be charged extra, you will not incur overage fees, and the provider will not auto-renew without your consent. This is the core advantage of prepaid: spending stops when your balance does. What happens next depends on your provider. Airalo and HelloRoam offer in-app top-ups. Open the app, select your active plan, and buy additional data that extends your existing profile. No new QR code scan required. Airalo's top-up options typically match the original plan's pricing tiers. HelloRoam lets you add data in smaller increments, which is useful if you only need another 500MB to finish a trip. Nomad, Saily, and most other providers do not support top-ups on existing plans. When your data runs out, you purchase a completely new plan and scan a new QR code. This is functional but more cumbersome, especially if you are standing on a street corner in an unfamiliar city trying to set up data access without data access. The workaround is to find WiFi (a cafe, hotel lobby, or public hotspot) to complete the purchase and installation. Some providers send low-data warnings. Airalo notifies you at 80% and 100% usage through push notifications. HelloRoam sends alerts at 75% and 95%. These warnings give you time to top up or buy a new plan before you hit zero. Nomad sends a notification only when data is fully exhausted, which is less helpful. A practical tip: always buy slightly more data than you think you need. The price difference between 3GB and 5GB is typically $3 to $5, which is a small insurance premium against the inconvenience of running dry mid-day.
Can you top up a prepaid eSIM?
Top-up support varies significantly by provider, and it is one of the most important features to check before you buy. The ability to add data to an existing plan without reinstalling a new profile saves real time and frustration while traveling. Airalo has the best top-up system. From the app, tap your active plan, select "Top Up," choose a data amount, and pay. The additional data merges into your existing plan immediately. No new QR code, no reconfiguration. We topped up an Airalo plan in Japan three times during testing without any interruption to service. Top-up pricing matches or comes close to the original per-GB cost. HelloRoam also supports top-ups through their app. The process is similar to Airalo's: select your active plan, add data, and confirm payment. HelloRoam's top-up increments tend to be smaller, starting at 500MB in some markets, which gives you finer control over spending. In our testing, top-ups activated within 60 seconds. Simly offers top-up functionality with a straightforward in-app flow. Roamless takes a different approach with pay-per-MB billing, which means you never technically run out of data as long as your account has credit. You just add funds to your balance rather than buying fixed data blocks. Nomad, Saily, GigSky, and most other providers require purchasing a completely new plan when your data runs out. This means a new QR code and a new profile installation. It works, but it is less convenient. If top-ups matter to you, prioritize Airalo, HelloRoam, or Simly. Flexiroam offers a unique middle ground with data rollover. Unused data from a previous plan rolls into your next purchase, which is a form of pre-paid top-up. This is useful for frequent travelers who buy a new plan every few weeks.