I signed up on Facebook with my mobile number and now I can't log in.

If you're having trouble logging in to Facebook with your mobile number, try these tips:
  • Make sure that you enter your entire mobile phone number, including the country code.
  • Leave out any extra zeros, plus signs (+) or other special characters.
If you're still having trouble, you can try to recover your account:
  • Go to facebook.com/login/identify and follow the instructions.
  • Make sure that you use a computer or mobile phone that you have previously used to log in to your Facebook account.
You can also take a look at these login troubleshooting tips.