![]() However, with a SIM from GiffGaff (a virtual carrier on o2's network), I'm able to use AT&T in the US because their MCC-MNC is on the list, but not in the home position. Since AT&T's MCC-MNC is 310-410, it's obvious the phone shouldn't be happy with it. Thieves are motivated to find ways to steal your phone number. Through the SIM connection, your mobile service provider links the phone to your number and account. Your phone uses a SIM card to connect with the mobile network. I'm guessing this restriction involves checking if the Mobile Country Code is from the United States (310-316, I think). A SIM card is a small chip in your phone that acts as the connection between your account and your phone. I'm able to use any international SIM, but I can't use a SIM from AT&T, T-Mobile or AirFire. ![]() I say "unlocked" in quotes because it's still restricted from US SIM cards. I have an iPhone 4S from Verizon, which they've "unlocked" for international use. ![]()
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