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Re:Starting today, wireless carriers have to unlock your phone by nanidin on Wednesday February 11, 2015 @08:09PM (#9036774)
My Sprint iPhone 4S worked fine on CDMA networks in the US, and it worked fine while traveling internationally on GSM / non-CDMA networks.

There's something going on in the baseband firmware that rejects domestic carrier SIM cards, but still allows international carriers when an international unlock is granted.

Re:Starting today, wireless carriers have to unlock your phone by pkamb on Thursday February 12, 2015 @04:55PM (#9041626)
Yes, my newly "unlocked" Sprint iPhone 5 will work fine overseas. It's specifically on non-Sprint domestic carriers where it won't work.