ReserveSMS

GMX asks for a mobile number: what to know

Updated 7 November 2026 · The ReserveSMS team

In short

  • GMX uses your mobile number to reset your password and to contact you about your account’s security.
  • If the SMS doesn’t come, wait 60 seconds and ask again.
  • GMX says a number already stored in many GMX accounts may not be accepted.

GMX asks for a mobile number when you register, so it can help you back in if you forget your password.

Why GMX wants it

GMX says it uses the number to recover your password and to contact you about your account’s security, and not for anything else, and that it doesn’t pass it to third parties. Depending on where you register, GMX may let you choose email verification instead.

The SMS check

GMX texts a code to the number. If it doesn’t arrive, or you type it wrongly, wait 60 seconds and ask for a new one. A number already stored in many other GMX accounts may not be accepted.

Two-factor authentication

Turning on two-factor authentication later also needs a verified number, which GMX uses to reset the password if you can’t get in.

Using a one-time number

GMX resets passwords through the number, and a number from ReserveSMS receives codes for 20 minutes only. If you use one to register, add a recovery email you keep straight away. Get a number for GMX.

Common questions

What does GMX use my mobile number for?

To recover your password and to contact you about your account’s security. GMX says it doesn’t use it for anything else or pass it on.

GMX’s SMS code didn’t arrive. What now?

Wait 60 seconds and ask for a new code. Check the number, too.

Why won’t GMX accept my number?

GMX says a number already stored in many other GMX accounts may not be accepted when you register.

Numbers for the apps in this guide

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