You need to enter a pin password when you receive a text message.

Well, now the SIM card has two passwords. A password, a PUK If your card is encrypted to prevent information from being leaked, it is a password. The default value is 1234. Or 0000. Can be modified. You should have three chances to enter the PIN code. If you make a mistake, the card will be locked and you will be asked to enter a more advanced PUK password. PUK's password was written when the card was made. It cannot be modified. PUK password will have three chances. If you enter it incorrectly, your card will be discarded. If you haven't entered the PUK password. You can take the card to the issuing place to unlock it.