A trip to the United States usually means long distances: a flight into New York or Los Angeles, a domestic connection, then a rental car and hours of driving between cities and national parks. Your phone does a lot of the work along the way, from maps and ride-hailing to hotel check-ins and park reservations. The United States is not part of the EU's Roam Like at Home area, so for most European visitors roaming is charged by the day or by the megabyte, and a two-week trip adds up.
This guide covers where coverage is strong, where it disappears, and how to keep in touch when it matters.
Key facts for the United States
- EU roaming: not covered by Roam Like at Home
- Local networks: AT&T, T-Mobile, Verizon (depending on the plan)
- Emergency number: 911, with text-to-911 in many areas
- Embassies: in Washington, D.C., with consulates in New York, Los Angeles, Miami and other large cities
Big cities: data does everything
In New York, Los Angeles, Chicago or Miami, coverage is strong almost everywhere above ground. Ride-hailing, restaurant reservations, museum tickets and transit apps all assume you are online. Contactless payment from a phone is widely accepted, and many event tickets are delivered only through an app.
Road trips and national parks
The gaps are outside the cities. Interstate highways are generally covered, but long rural stretches in the West have weak or no signal, and in many national parks, such as Yellowstone, Yosemite, the Grand Canyon or Death Valley, coverage is limited to visitor centres and lodges. Before you drive in:
- download offline maps for the whole park and the roads around it;
- save your reservations and the park's emergency information on the phone;
- tell someone your route and when you expect to have signal again.
Crossing into Canada or Mexico
Many itineraries include Vancouver, Niagara Falls or a day in Tijuana. A plan for the United States works only in the United States. If your trip crosses a border, a regional Americas plan can keep you on one eSIM; check the list of countries on the plan page.
Getting connected
A travel eSIM installs at home with a QR code and its validity starts when it first connects in the United States. It is a data line: your own number keeps receiving texts, WhatsApp calls run over data, and you can share the connection with a laptop on the road.
A US prepaid SIM is sold in carrier stores and large retailers if you want a local number for calls.
Free Wi-Fi is common in cafés, hotels and airports, but you will not have it on the highway or in the parks.
Consular protection: 911 and getting help
- 911 is the emergency number for police, fire and ambulance everywhere in the country.
- Text-to-911 works in many areas but not all; if you can, call. If a text cannot be delivered, you will get an error message.
- Embassies are in Washington, D.C., and many countries also have consulates in large cities. The Telcomia app shows yours, with address and phone.
- If you are an EU citizen and your country has no embassy or consulate in the United States, the embassy of any other EU country must help you on the same terms as its own nationals (Article 23 of the Treaty on the Functioning of the EU).
United States travel-safety page →
Questions travellers ask about the United States
Will my phone work in the national parks?
Mostly near visitor centres and lodges. Large parts of many parks have no signal, so plan with offline maps.
Which networks does a Telcomia eSIM use in the United States?
AT&T, T-Mobile or Verizon, depending on the plan, with 4G and 5G where available.
Can I text 911 if I cannot call?
In many areas, yes. Where text-to-911 is not available, you receive an error message, so try calling.
Does a US plan work in Canada or Mexico?
No. A plan for the United States works only there; a regional Americas plan covers several countries.
The short version
Install the eSIM before you fly, switch it on when you land, download offline maps before every park or long drive, and keep 911 in mind.
See plans for the United States →
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