Your phone can become blocked if you enter the wrong SIM card pin number three times in a row. If this happens you won’t be able to make and receive calls or texts. To unblock your SIM, you will need a PUK (Personal Unblocking Key) code.
PUK codes are different from PAC codes. PAC codes are used when you want to keep your mobile number when switching providers.
You can find your PUK code on the My Account portal. Click here to see how.