What is a one-time phone number, and when should you use one?
In short
- A one-time number receives the verification code for a single sign-up, then stops working.
- It keeps your own number away from apps you don’t fully trust, and from leaks and spam.
- It isn’t for accounts that will text codes to the number later: use a number you keep, or switch them to an email or authenticator app.
A one-time phone number is a number you use for one thing: receiving a verification code.
How it works
- Choose the app and the country.
- Enter the number you’re given in the app, and ask it to send the code.
- The code shows on screen as soon as the SMS arrives.
On ReserveSMS the number receives codes for 20 minutes. If no code arrives in that time, the money goes back to your balance automatically, so you can try another number.
How it differs from a second-number app
Second-number apps give you a number you keep, usually with a subscription, for calls and texts. A one-time number is for a single code, with nothing to cancel afterwards. Use a second number if people need to reach you on it; use a one-time number to get through a sign-up without giving out your own.
When it makes sense
- Signing up to an app you’re trying out, without handing it your real number.
- Keeping your number off sites that might leak it or sell it to marketers.
- Getting a code from another country’s number when an app asks for one.
When it doesn’t
Don’t use one for banking, or for any account that texts sign-in or recovery codes to its number: the number can’t receive them later. Our guide on keeping an account after a temporary number explains what to set up once you’re in. And unlike free public SMS sites, a one-time number isn’t listed publicly for anyone to read.
Common questions
Can a one-time number receive more than one code?
On ReserveSMS, yes, while its 20-minute window is open: ask the app to send another code and it shows on the order page. After the window, the number can’t receive anything.
Is a one-time number the same as a burner number?
It’s a similar idea. A burner number usually lasts days or weeks and can take calls; a one-time number is for a single verification code.
What happens if no code arrives?
On ReserveSMS, the money goes back to your balance automatically after 20 minutes, or straight away if you cancel first, so you can try another number.