For a visitor to the United States, the lowest total usually comes from a prepaid travel eSIM for data on trips of a few days to a few weeks, while a US prepaid SIM can win on a long stay that needs a US number. Roaming wins only if your plan includes the US. Compare whole-trip totals, including taxes and calls.
See United States plans ↗Compare your costsCommercial link: this site is published by BroadNet, the company behind TripoSIM.
Key facts
- A US prepaid SIM gives you a US number; a travel eSIM is data-only.
- US prepaid prices are often shown before taxes and fees; ask for the total at the till.
- Roaming day passes bill calendar days, including flight days.
- TripoSIM's US page is the authoritative price for the eSIM line.
On this page
- Short answer
- What are your three options in the United States?
- What does roaming in the US cost?
- What does a US prepaid SIM really cost?
- What does a travel eSIM add up to?
- How do the three compare for a 12-day trip?
- What if the trip includes Canada or Mexico?
- What should you check before paying for any option?
- What about students and long stays in the US?
- FAQ
What are your three options in the United States?
A visitor to the US has three practical ways to stay connected: keep using the home line on roaming, buy a US prepaid SIM after landing, or install a prepaid travel eSIM before departure. A fourth, staying on Wi-Fi only, works for some trips and is covered in can you travel on Wi-Fi only?
Each option charges in a different way. Roaming multiplies a daily price by billed days. A US prepaid SIM is a monthly plan bought in a shop or online, with a US number. A travel eSIM is one prepaid price for set days and data. The cheapest one depends on your trip, not on which looks cheapest on a banner.
What does roaming in the US cost?
Look up the United States on your carrier's roaming page. If the US is included in your plan, your extra cost may be zero, within a fair-use limit. If it is not included, you will usually see a day pass or a weekly pass. Multiply the day price by the number of days you will actually use the phone, from the day you land until the day you fly home.
Two lines are easy to forget:
- Time zones. A carrier that bills days in your home time zone can count a US evening as the next day. Long trips westwards can add a billed day.
- Calls and texts. Some passes include calls and texts; others only data. If you call US numbers often, check the per-minute rate.
What does a US prepaid SIM really cost?
US prepaid plans are usually monthly, so a 10-day visitor pays for a month either way. The shelf price is also often shown before sales tax and local fees, which differ from state to state. The real lines are:
- Monthly plan, shelf price (example)$30.00
- Sales tax and fees at the till (example)$3.60
- SIM card or activation charge (example)$5.00
- Travel time to a store on day onenot charged, but real
- Total for the visit$38.60
The prepaid SIM wins when you need a US number for many local calls, when you stay a month or longer, or when you want unlimited calling to US numbers. For a short trip it means a store visit on arrival day and, on a single-SIM phone, taking your home SIM out, so your own number goes quiet.
What does a travel eSIM add up to?
A travel eSIM is bought online and installed at home on Wi-Fi. On landing, you switch its line on and choose it for mobile data, while your home SIM stays on for calls and texts to your own number. The cost lines are the plan price, any top-up, and a card fee if your card charges for a foreign-currency payment. TripoSIM, for example, states that there are no taxes added at checkout and that plans start when the eSIM first connects at the destination.
TripoSIM's public price index listed United States with 20 plans: 1 GB from $1.50, 5 GB from $6.00, 10 GB from $12.08, and unlimited-data plans from $2.27. These are the cheapest plans of each size in TripoSIM's own catalogue that day; check each plan's days before comparing. Prices change, and the live United States page is authoritative.
What it does not give you is a US number. If you need to be called by US numbers, add the cost of that to the eSIM column: incoming roaming calls on your home line, or a separate number service.
How do the three compare for a 12-day trip?
One adult, 12 days in two states, light calling. All numbers are invented examples so the arithmetic can be followed; replace them with the quotes you get.
- Roaming day pass, 13 billed days at $12$156
- US prepaid SIM, month plan with tax and SIM$39.00
- Travel eSIM, 15-day plan$22.00
- Travel eSIM plus 20 min of roaming calls at $1$42.00
Example numbers. The fourth bar adds the cost of calls on your own number while the eSIM carries the data.
On these numbers both prepaid options are far below the roaming pass. The eSIM is cheapest for data alone; once you add the calls you still need on your own number, the US prepaid SIM comes close. That is the real decision for a US trip: how much do you need to call and be called on a phone number?
What if the trip includes Canada or Mexico?
A single-country US plan does not cover a day trip to Vancouver or Tijuana. You have three choices: a regional North America plan that lists every country you will visit, a second single-country plan for the side trip, or roaming for that one day. Price all three. A one-day side trip is often cheapest on a roaming day pass; a week in each country usually favours a regional plan. See US and Canada cross-border plan costs.
What should you check before paying for any option?
- Phone unlocked
Needed for a US prepaid SIM and for any travel eSIM from another seller.
- eSIM support confirmed
Look for "Add eSIM" or "Add Cellular Plan" in settings.
- Billed days counted
Landing day to departure day, in the carrier's time zone.
- Total price with tax
For prepaid SIMs, the till total, not the shelf price.
- Calls on your own number priced
The line the data-only options leave out.
Then compare the totals in the trip connectivity cost calculator. For a closer look at the roaming side, see roaming spending caps and usage alerts.
What about students and long stays in the US?
For a semester or a work placement, the answer shifts. A US prepaid or postpaid plan with a local number becomes useful once landlords, employers and banks need to call you. Many long-stay visitors use a travel eSIM for the first days, while they sort out an address and a plan, then move to a local plan. That way you are not forced to buy a contract in an airport on day one. Our semester cost model walks through the numbers.
Frequently asked questions
Do I need a US phone number when visiting the USA?
Most visitors do not. Hotels, airlines and ride apps work with your home number and app messages. A US number helps if you will receive many local calls, for example on a long work assignment or when renting a home. If you need one, compare a US prepaid SIM with keeping your own number and calling by app.
Are US prepaid SIM prices shown with tax?
Often not. Prices on US shelves and websites are commonly shown before sales tax and some fees, which vary by state. Ask for the total you will pay before you buy, and use that figure in your comparison.
Will my phone work in the United States?
Most recent unlocked phones work on US networks, but check that your model supports the bands used by US carriers and, for an eSIM, that it is eSIM-capable and unlocked. A locked phone cannot use a US prepaid SIM or a travel eSIM from another seller.
Is Wi-Fi calling a way to avoid roaming in the US?
Wi-Fi calling can make calls to your home country cost the same as at home on some plans, but rules differ by carrier. It does not give you mobile data on the street. See our guide to Wi-Fi calling costs.
Related reads
Sources and notes
Prices in this article are labelled examples for the arithmetic, not offers, unless a line says it is a dated TripoSIM price. TripoSIM facts are quoted from its public pages on the date shown and can change; the TripoSIM checkout and policy pages are authoritative.