How to unlock iPhone from att carrier 2023 | AT&T-SIM-UNLOCK

 

1. SIM lock-In order to provide security to stolen Phones there's a SIM lock in-built by the manufacturer. In the event, the phone is stolen the phone would ask for a SIM lock(mostly the digit pin) to register/verify the user. Once the user Is registered the phone would function normally.
2. Network Lock-This is the manufacturer's built-in feature to prevent any subscriber to switch to Another Telecom operator other than the one the manufacturer has contracted with the Operator(Basically these contract phones are cheaper than the Factory Unlock Phones). So what you have done is that you have purchased the Network Lock only to unlock the phone to use with other Telecom operators but not to use the phone.

In order to use the phone you need the SIM lock which would be available with your service provider.

In case you entered the SIM lock wrong 3 consecutive times then your phone would get locked and would ask for a PUK code which will also be available by the operator but would require a lengthy process. So I suggest you contact your service provider regarding the SIM lock key and don't unnecessarily enter the Pin if you don't know to avoid the PUK code.