My S8+ (SM-G955U) will not accept the unlock code I have received from AT&T. I've spoken with countless AT&T reps and they have all confirmed that I DO in fact have the correct unlock code for my device. The prompt reads " SIM network PIN blocked. Enter SIM network PUK. I'm certain i do not need the sim's puk codes as I have already tried them with no luck. I've been desperate for a solution for over 2 weeks now. Any ideas on how to obtain the MCK code (DEFREEZE or SIM network PUK) for my device, or maybe even an alternate solution. Thanks
Get another sim card, it's asking for the sim's cards pin number to unlock the sim card itself and has nothing to do with the phone.
I've already tried a new sim card. If its not AT&T, it will not work.