Best SIM and eSIM for United States: data plans, Wi-Fi and phone tips

Three routes cover almost every traveller. A travel eSIM is a data-only plan you install on your phone before flying; it activates when you land and avoids a store visit. A prepaid physical SIM from a US carrier gives you a US phone number, which matters if you need to receive calls, book tables or give a number to a hotel. Roaming on your home plan is the simplest option but is usually charged per day.

If you need a US number and a lot of data, prepaid is the better buy. If you mainly need maps, messaging and ride-hailing, an eSIM is enough. Many travellers run both: eSIM for data, home SIM left active for bank codes and two-factor texts.

Buy and install the eSIM at home, on Wi-Fi, before you fly. Most providers send a QR code or an app profile; install it, then leave it switched off until you land so it does not activate early (check).

On landing, turn the eSIM line on and set it as your mobile data line. Keep your home SIM on for calls and texts but turn off data roaming on it, or you may be charged. Turn on data roaming for the eSIM itself if the provider requires it — many travel eSIMs need this setting enabled to connect (check).

Test it before you leave the airport: open a map, load a page, send a message. If nothing works, check that the eSIM is the selected data line and that airplane mode has been toggled off and on.

AT&T, Verizon and T-Mobile cover the country, but coverage varies by carrier and location, and gaps occur in many national parks, canyons and desert highways, where it can be tens of kilometres between towns.

Download offline maps for every park and long drive before you set off, and save tickets, reservations and directions offline too. The NPS App and Recreation.gov are useful for park information and reservations, but both need a connection to load new data.

If you are driving remote routes, tell someone your plan and carry water. A phone with no signal is not a safety net.

Free Wi-Fi is easy to find in cafés, hotels, libraries and many chain restaurants, but public networks are often unencrypted, so avoid banking on them or use a VPN. Hotel Wi-Fi is usually fine for messaging and maps.

US numbers are ten digits: a three-digit area code plus seven digits, with country code +1 from abroad. To call emergency services, dial 911. Ride-hailing apps such as Uber or Lyft work over data and are the usual way to get around cities without a car.

If you keep your home number active, expect two-factor codes and bank texts to keep arriving. That is the main reason many travellers run an eSIM for data and leave the home SIM in place.

Buy your eSIM before you fly rather than at the airport, where kiosks are convenient but pricier. If you want a physical SIM, carrier stores and big-box shops such as Walmart and Target sell prepaid options, and you will need your passport to activate.

Check your phone is unlocked before you travel. A phone locked to a home carrier will not accept a US SIM, though an eSIM from a travel provider may still work if the phone supports it. Compatibility is model- and carrier-dependent, so confirm with the provider (check).

Prices and plan rules change often, so treat the figures here as 2026 estimates and confirm current rates with the provider before buying.