US phone numbers for receiving verification codes

Three ordinary reasons, and none of them is about you personally. The service only operates in the US and treats the country code as a cheap eligibility check. Its SMS route only reaches US carriers, so a foreign number would silently fail. Or its fraud rules are tuned on US traffic and anything else scores worse.

Whichever it is, the form is reading the country code on a number normalised to international format — a US line starts +1 and carries a three-digit area code and a seven-digit subscriber number. That is the entire test at this stage.

A carrier-issued mobile line, rented from a pool for the length of one order. In a carrier lookup — the check a signup form runs before it sends anything — it resolves to a mobile network operator rather than to an internet telephony provider. Non-VoIP numbers explains that lookup in full, because it is the single most common reason a number is refused before any message exists.

What you are renting is the ability to receive on that line, not the line itself. There is no SIM, no handset and no outbound path: the number receives SMS and nothing else.

You can ask for a particular state, or name area codes you want, when you place the order. It costs a markup over the list price, shown before you confirm, because a filtered request draws from a smaller pool.

Be clear about what it buys. To a verification form, a US number is a US number — the area code almost never decides whether the code is sent. Where it matters is the small set of services that compare the area code against an address you gave them, and cases where you simply want a number that reads as local. If neither applies, the unfiltered order is cheaper and draws from the whole pool, which means it fills faster.

Nothing about the order depends on where you are. You register, add a balance, order a US number and read the code in the browser; the message reaches the carrier holding that number, and we show it to you.

What your own location can still affect is the service you are signing up to. Some check the country of the payment card, the app-store account or the connection as well as the number, and a US number on its own does not answer those. If a service is not available to you, a number is not what is stopping it — and getting around that check is not what these numbers are for.

Stated plainly, since it decides whether this is the right product:

• It will not satisfy a form that demands a local number somewhere else. A site asking for a number in its own country wants that country code, not a US one.
• It will not take voice calls. A service that only reads codes out over the phone has no path to you.
• It will not stay yours. The number is released when the order ends and reissued to somebody else.
• It will not guarantee acceptance. Line type is one check among several, and a service that already has an account on that number, or blocks its range, will refuse it regardless.

The countries each service covers are listed against it on the price list, so you can see what a given verification actually needs before you spend anything.

Every service is priced individually and per verification — there is no subscription and no minimum. The price sits next to the service name before you order, the figure at the top of this page is the cheapest in the catalogue right now, and the full price list has all of them. If no code arrives before the number expires, cancel the order and the charge comes back.