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The United States is a country where mobile coverage genuinely varies — brilliant in the cities, excellent along the interstates, and properly absent in the places people drive hours to reach. Buying data for a US trip is mostly about planning for that last category.
Coverage, honestly
Cities and suburbs. New York, Los Angeles, Chicago, Miami, San Francisco, Seattle, Austin — dense 4G everywhere and broad 5G. No complaints.
Interstates and major highways. Consistent coverage along the routes, including most of the classic road trips. You will drop for a few minutes at a time, not for hours.
National parks. This is the real gap. Expect no signal at all across large parts of Yellowstone, Yosemite, Zion, Glacier and the Grand Canyon's less-visited rims. Visitor centres and lodges often have Wi-Fi; the trails do not.
Rural stretches. Nevada, Wyoming, Montana, west Texas and much of the Dakotas have long quiet sections. Plan around them rather than hoping.
If your itinerary includes a national park, download offline maps, your booking confirmations and your playlists before you leave the last town. This is not a plan problem — no plan solves it, because there is no network to connect to.
How much data for a US trip
American trips tend to be driving trips, and driving means navigation running for hours. Even so, maps are light — the video is what costs you.
- A week in one city — 3 to 5 GB. Hotel and café Wi-Fi covers the rest.
- A two-week road trip — 8 to 12 GB. Constant navigation, photo uploads, occasional streaming in the car.
- Working while travelling — add 1 GB per hour of video calls and budget generously.
A useful trick for road trips: download the whole route's offline map region in advance. It keeps navigation working through the dead zones and cuts data use to nearly nothing.
Canada and Mexico on the same trip
If your route crosses a border — Niagara, Vancouver, Tijuana, a Baja detour — check whether a North America regional plan covers all three countries. Crossing with a US-only plan means buying again on the other side.
Compare North America regional plans
Before you fly
- Confirm your phone supports eSIM and is carrier-unlocked. Check here
- Install the eSIM at home, on Wi-Fi, and leave the line switched off.
- On landing, enable the line and turn on data roaming for that line only.
- Switch mobile data off on your home line, so nothing falls back to it at US roaming rates.
Two things specific to the US
Phone calls. Travel eSIMs are data-only. For calls, use WhatsApp, FaceTime or your home line — and remember that US toll-free numbers (1-800) often will not connect from a foreign line, which matters when you need to reach a rental car company or an airline.
Verification codes. US services lean heavily on SMS verification. Keep your home SIM active for texts even while all your data runs over the eSIM. It costs nothing to receive SMS on most plans, and it saves a lot of frustration at a hotel check-in.
In short
Buy around 10 GB for two weeks, install before you fly, and download offline maps for every national park on the itinerary. The plan handles the cities and the highways; the offline maps handle everything the network cannot.