Several situations are possible:

1. Login or password are entered incorrectly:
   Please check the correctness of the entered email or try to recover the password. The message on password recovery may get into "Spam" folder;.
2. You got registered via Google:
   In this case you do not have a login and password on the website, since you pass authorization via Gmail account. Try to login to the system, by clicking on the red "Google" button;.
3. Your account was deleted:
   According to clause 10 (https://5sim.net/rules), account will be deleted, if you do not use it for more than 1 year, the balance will not be restored;.
4. IP address:
   Please, try to change your IP address and log in to your account. Sometimes the problem may be related to your IP address;.