GlobeQuest
Telecom🇺🇸 San Jose, United States

Getting a US phone number, and staying connected through a shutoff

The US has no SIM registration requirement, so getting connected is trivially easy: buy a prepaid SIM or eSIM and it works immediately. The friction is postpaid contracts, which run a credit check you cannot pass on arrival. What is genuinely local is resilience: the utility de-energises lines pre-emptively in fire weather, California requires mobile networks to hold backup power in high fire-risk areas, and after a significant earthquake text messages get through when calls do not. A power bank and a household meeting point are ordinary preparedness here.

Total cost
Prepaid unlimited plans from the major carriers and MVNOs sit in a broad monthly band with frequent promotional pricing. Postpaid costs more and may require a deposit without a credit file. Home internet in San Jose is unusually competitive by US standards — fibre reaches a large share of the city — but check the specific address rather than the neighbourhood.
Time needed
Immediate — an eSIM activates in minutes, a physical SIM on insertion.
Validity
Prepaid renews monthly and lapses if unpaid, with the number released after a period of inactivity. Postpaid runs until cancelled, often with device financing attached that survives the cancellation.
Verified
August 2026
Medium confidence·Anyone arriving in the US. Mobile service is federally regulated and the carriers are national. The California-specific notes are power: pre-emptive utility shutoffs during fire weather, and an earthquake risk that makes an offline plan more than theoretical.

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. 1

    Activate an eSIM before flying, or buy prepaid on arrival

    A US eSIM activates before you land so you have a working number immediately for rides, deliveries and bank verification codes. No identity registration is required at any point.

    OnlineWho: YouDay 1
  2. 2

    Check your handset is unlocked and band-compatible

    Phones bought on contract abroad are frequently locked, and US band combinations trip up some regional models. With 3G shut down there is no fallback network to land on.

    OnlineWho: You
  3. 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. Prepaid has no check and is usually cheaper for the same data allowance.

    OnlineWho: You
  4. 4

    Enable Wireless Emergency Alerts and register for county alerts

    Federal wireless alerts cover evacuation and severe weather warnings. Santa Clara County also runs its own opt-in alert system for local emergencies, which is more granular. Sign up for both in your first week.

    Mobile appWho: YouWeek 1
  5. 5

    Prepare for a Public Safety Power Shutoff

    The utility cuts power pre-emptively during dry, windy conditions in high fire-risk areas. It hits the hills harder than the valley floor, but it can affect anyone. Keep a charged power bank, know your address's shutoff risk on the utility's map, and remember that a home internet router without power takes your Wi-Fi calling with it.

    OnlineWho: You
  6. 6

    Know that text beats voice after a quake

    After a significant earthquake voice networks congest immediately while SMS and data often still get through. Agree an out-of-area contact with family before you need one — the standard California advice is that everyone texts one person outside the region rather than each other.

    In personWho: You
  7. 7

    Port rather than cancel if you switch later

    Number portability is a legal right and works between carriers and MVNOs. Request the port from the new carrier — never cancel the old service first, or you lose the number.

    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

A power shutoff takes your home internet with it, and your Wi-Fi calling.

People plan for the lights and forget the router. In a PSPS the fibre or cable terminal in the house loses power even if the network upstream is fine, so anyone relying on Wi-Fi calling for a weak indoor signal loses their phone service too. A small uninterruptible power supply on the router is a cheap and unusually effective purchase here.

Source: community-reported

Text messages get through after an earthquake when calls do not.

Voice capacity congests within minutes of a significant quake while SMS queues and delivers. California's standard household plan is an agreed out-of-area contact everyone texts, rather than everyone calling each other. Set it up while nothing is happening.

Source: California Governor's Office of Emergency Services

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 it entirely and usually costs less for the same data.

Source: community-reported

The US has no SIM registration at all.

Most countries in this app require passport registration to activate a SIM. The US requires nothing whatsoever for prepaid — you can buy one in a supermarket and be online in minutes.

Source: FCC — consumer guides

Common mistakes to avoid

  • Assuming Wi-Fi calling will cover a weak indoor signal during a power shutoff.
  • Applying for postpaid with no credit file and facing a large deposit.
  • Bringing a carrier-locked handset from abroad and discovering it on arrival.
  • Silencing emergency alerts after one loud test, in a fire and earthquake region.
  • Cancelling the old carrier before requesting the port, and losing the number.

Some of this may be out of date. Spotted something inaccurate? Help us keep it right for the next newcomer.

Make it your personal checklist

Globe Quest turns this into a tracked, AI-personalized plan for San Jose — timed to your move date, with reminders so nothing slips. Free to start.

Sources

Last verified August 2026. Government processes change — always confirm critical details against the official source before acting.

More on settling into San Jose

Legal & ID
Status, Social Security number and California's very short clock
Driving
20 days to register, the smog certificate, and a car you may not be able to bring
Banking
Opening a bank account, building credit, and being paid partly in stock
Health
Covered California, a state individual mandate, and Medi-Cal
Tax
The highest state income tax in the country, and Proposition 13 underneath it
San Jose guideCost of livingLanguageCulture