eSIM vs SIM card vs Wi-Fi router: which is right for your trip?

For most travelers, an eSIM is the most convenient option: install before departure, keep your home number active, and connect as soon as you land. A physical SIM is a good fallback if your phone is carrier-locked. A Wi-Fi router makes sense when you are sharing data across multiple devices on a longer trip.

An eSIM is built into your phone — no physical card, no airport queue. You download a profile before you leave and activate it when the plan should start.

The main trade-off is device compatibility. Not all phones support eSIM, and carrier-locked devices may fail to connect even after a successful install. Always check your phone's EID before buying.

A local SIM gives you a local number and typically strong in-country coverage. In Japan, SIM cards are available at airport vending machines and convenience stores.

The downside is that it replaces your home SIM, so calls and SMS to your usual number are unavailable unless you carry a second phone or use call forwarding.

A portable Wi-Fi router connects multiple devices — phones, tablets, laptops — to a single data plan. In Japan, pocket routers are available for daily or trip rental at major airports.

The trade-off is the extra device: you need to keep it charged, carry it with you, and return it at the end of the trip. It is most practical for groups or travelers who need to keep a laptop online throughout the day.

Choose an eSIM if your phone supports it and you are traveling solo or with a partner who has their own device.

Choose a physical SIM if your phone is carrier-locked or if you want a local number for the destination.

Choose a Wi-Fi router if you are traveling as a group, need to keep a laptop connected, or are visiting Japan where pocket router rentals are widely available and competitively priced.