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Does the phone indicate anything on its screen, when a call comes inbound to your phone #?
If you did a factory reset, you realize that wipes the association with a phone #, and it won't ring until re-associated with it or any other phone # ?
It will have to be re-configured and/or activated for your phone service and number (and account too perhaps), after every factory reset and data wipe, before it will use that phone # *****
I'm not clear exactly what status the phone is in at present... you mention a PIN #... it may be another, more rarely needed type of #... tell me what the prompt for it says, exactly, please.