Before you start

An unlocked handset, or an eSIM-capable one
A US address for postpaid, but not for prepaid
A payment method — prepaid accepts foreign cards, postpaid usually does not

Step-by-step

1
Activate an eSIM before flying, or buy prepaid on arrival
A US eSIM can be activated before you land so you have a working number immediately. Otherwise carrier stores, the airport and big-box retailers sell prepaid SIMs. No identity registration is required at any point.
OnlineWho: YouDay 1
2
Check your handset is unlocked and band-compatible
Phones bought on contract abroad are frequently carrier-locked, and US band combinations trip up some regional models. With 3G shut down there is no fallback. Check the carrier's compatibility tool against your exact model.
OnlineWho: You
3
Start prepaid rather than fighting a credit check
Postpaid runs a credit check. With no US file you will be declined or asked for a deposit of a few hundred dollars. Prepaid has no check, no contract and is usually cheaper for the same data.
OnlineWho: You
4
Consider an MVNO on the same towers
Mint Mobile, Visible, US Mobile and Google Fi resell capacity on AT&T, T-Mobile and Verizon. Same coverage for materially less; the trade is deprioritised data during congestion and lighter support.
Mobile appWho: You
5
Get a US number before you need it for verification
Banks, the DPS portal, rental applications and government sites send SMS codes to US numbers and often reject foreign ones. Getting the number early clears a lot of downstream blockers.
Mobile appWho: YouWeek 1
6
Check coverage on the roads you will actually drive
In a car-dependent metro this matters more than in a walkable one. Coverage west into the Hill Country and along stretches of rural highway degrades faster than the marketing maps suggest — worth verifying if you commute from outside the city.
OnlineWho: You

Documents you’ll need

Passport for postpaid; nothing at all for prepaid
US address for postpaid
A payment card — prepaid usually accepts foreign cards, postpaid rarely does

Things most newcomers don’t know

The US has no SIM registration at all.

Most countries in this app require passport registration to activate a SIM and several require biometrics. The US requires nothing for prepaid. Arriving from the Gulf, South Asia or Southeast Asia, the absence of paperwork feels like an oversight — it isn't.

Source: community-reported

The credit check is the barrier, not the documentation.

Carriers check credit before offering postpaid and a newcomer with no file gets declined or charged a deposit. Prepaid sidesteps the check entirely and usually costs less, so the workaround is also the better deal.

Source: community-reported

In a driving city, coverage on your commute matters more than in the city core.

Austin's metro sprawls from Georgetown to San Marcos and many people commute forty-plus minutes. Carrier coverage varies noticeably along the fringes and into the Hill Country. Check a coverage map against your specific route before committing to a plan or a suburb.

Source: community-reported

MVNOs use the same towers for meaningfully less.

Mint, Visible, US Mobile and Google Fi lease capacity from the big three. Coverage is identical; what you give up is priority during congestion and retail support. For a single line the saving is large and the compromise small.

Source: community-reported