eSIM vs Pocket WiFi vs International Roaming: Which Should You Use?
There are four common ways to get mobile data abroad. None is best for everyone. This guide compares them on the things that actually change your trip: cost structure, setup effort, sharing, and what happens when something goes wrong.
The four options at a glance
| Travel eSIM | Pocket WiFi rental | Home-carrier roaming | Local SIM card | |
|---|---|---|---|---|
| How you pay | Prepaid package, bought online | Daily rental + often a deposit | Daily pass or pay-per-use on your bill | Prepaid, bought on arrival |
| Setup | Install before you fly | Pick up / return device | Usually nothing | Find a shop; ID often required |
| Keeps home number active | Yes (dual SIM) | Yes | Yes | Only on dual-SIM phones |
| Sharing | Hotspot (rules vary) | Designed for several devices | Hotspot (rules vary) | Hotspot (rules vary) |
| Extra device to charge | No | Yes | No | No |
| Local phone number | Usually no | No | No (home number) | Usually yes |
Travel eSIM
Good for: solo travelers and couples with compatible phones who want data the moment they land. Plans are cheap at the small end — for example, Saily lists 1 GB in Thailand for $2.99 and Nomad lists 1 GB in Japan for $4 (official pages, Nov 2026). Less good for: older or carrier-locked phones, and people who need a local phone number.
Pocket WiFi
A pocket WiFi is a small battery-powered router you rent. Its strengths are real: it works with any WiFi device, and one rental can serve a family or group. Its downsides are logistics — pickup and return, a battery to charge daily, and everyone needing to stay near the device. Rental pricing varies widely by country and company, so compare a specific quote against eSIM prices for each person in your group. (Some eSIM providers publish their own comparison claims about pocket WiFi; treat any vendor's comparison as marketing and do the maths for your own trip.)
Home-carrier roaming
Roaming is the zero-effort option: your phone just works. Many carriers now sell daily or weekly passes, which can be reasonable for a day or two. Pay-as-you-go rates without a pass can be very expensive. Before you travel, look up your carrier's current roaming page and compare the total for your trip against an eSIM. If you live in the EU and are travelling inside the EU, your plan may already cover you.
Local SIM card
A local SIM gives you a local number and often generous data. You may need your passport to register it, and airport kiosks are not always the cheapest place to buy. It only makes sense if your phone accepts a second SIM or you're willing to remove your home SIM.
Bottom line
- Compatible phone, 1–2 people: a travel eSIM is usually the simplest and cheapest. Start with our provider comparison.
- Group or family, or non-eSIM devices: price a pocket WiFi against one eSIM per person.
- One-day stopover: your carrier's day pass may be good enough.
- Long stay, need a number: a local SIM.
Sources
All prices and plan facts below were read from these official pages on November 4, 2026 (Last checked: Nov 2026). We have not purchased or tested these plans ourselves; we summarize what the providers publish, in our own words.
- Saily — eSIM for Thailand — last checked Nov 4, 2026
- Nomad — Japan eSIM — last checked Nov 4, 2026
- Saily — eSIM for Japan — last checked Nov 4, 2026