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A SIM card is an integrated circuit that securely stores the data used to identify a subscriber within a mobile network.

3 votes
0 answers
78k views

Network SIM unlock code not working

I paid to get an unlock code for my Samsung Galaxy S4 Active SGH-I537 locked to AT&T. I have tried to enter the unlock code given when the phone boots with my other carrier SIM card inserted, but get …
Rick's user avatar
  • 233
1 vote
1 answer
9k views

Mobile network not available on unlocked Active

I purchased a "new" unlocked Samsung Galaxy S4 Active SGH-I537 phone on E-Bay. Everything works fine except when I use the phone with my local carrier SIM card. When I insert the SIM card and turn on …
Rick's user avatar
  • 233