An eSIM gives one phone its own data plan. A pocket Wi-Fi gives many devices one shared connection. For a couple or one traveller, an eSIM is often simpler. For a family or a group that shares one plan, a pocket Wi-Fi can be the better choice. Decide by the number of devices, the phones you bring and how you handle power and returns.
Start with your phones
Before you compare plans, check your phone:
- Is it unlocked, so it accepts another carrier's SIM?
- Does it support eSIM? Many newer phones do, but some regional models do not.
- Can you keep one phone on for maps and messages all day?
If the answer to the first two questions is no, a pocket Wi-Fi is the safer choice.
Check first: Look up your phone model on the manufacturer's site for eSIM support, and check your carrier's rules for unlocking. Do this before you buy any plan.
What an eSIM gives you
An eSIM is a digital SIM. You install it on your phone before the trip, and the phone uses it when you land. You do not carry a second device to charge.
Good for:
- One traveller, or a couple who each have an eSIM-ready phone
- People who want no extra device in the bag
- Phones that you use for maps, tickets and messages
Watch for:
- Each phone needs its own plan. Two people on one plan may not work.
- You may not be able to share data with the rest of the group.
- Setup must happen before you go, with Wi-Fi.
What a pocket Wi-Fi gives you
A pocket Wi-Fi is a small device that makes its own Wi-Fi network. Everyone in the group connects to it, so one plan covers several phones, tablets and laptops.
Good for:
- Families and groups who share one data plan
- Phones that are not eSIM-ready
- Travellers who want a backup connection
Watch for:
- You must charge the device every day. Carry a power bank, and check the power-bank rules before you fly.
- You must return or drop off the device at the end of the trip.
- If the device is lost or stolen, the whole group loses its data.
A simple comparison
| Question | eSIM | Pocket Wi-Fi |
|---|---|---|
| Phones in the group | One phone per plan | Many devices on one plan |
| Extra device to carry | No | Yes |
| Charging | Phone only | Phone and the device |
| Returns | None | Yes |
| Best for | Couples, solo | Families, groups |
How to choose for your group
- Two adults with eSIM-ready phones: Each buys an eSIM, or one of them buys a small data plan and shares a hotspot. Check hotspot rules first.
- A family with children and one shared device: A pocket Wi-Fi is often easier. Keep it in a bag with the power bank.
- A group with mixed phones: Ask whether one plan can cover all of them. If not, buy a pocket Wi-Fi.
Before you pay
Read the coverage map, the data limit, the return rules and the cancellation terms on the provider's official site. Sellers and resellers vary, so compare with the official provider. Look at the total cost for your whole group, not one price per device.
Save data in daily use
Data use grows fast when you use maps, video and music on the move. You can keep your plan lasting longer with a few habits:
- Download offline maps for each city before you leave the hotel.
- Turn off automatic app updates and video autoplay while you use mobile data.
- Use hotel and cafe Wi-Fi for uploads, large downloads and video calls.
- If you share a hotspot, set a password, and agree on who uses it for large tasks.
Check your data use each evening. If it is high, change one habit the next day. This is easier than running out of data in the middle of a train transfer.
What to do next
Pick the option that fits your group, then set it up before you fly. Read the Tokyo and Kyoto guides to see which areas need the most data.