Iphone 5s Unlocked Apple Store Availability. You may have more than enough information to call your mobile operator to make you (or your parents, if you are in a single account) and try to access your account to cause damage. When a pattern appears, the manufacturer can tag specific IMIE numbers assigned to the bad group of phones and add these phones to a known bug list. The only thing GSM has to offer in terms of CDMA coverage is that it is much longer and therefore very much. It is still used by parts of the world, so you may not have CDMA coverage all over the world. Can I Use A Unlocked Phone With Boost Mobile. It completely GSM, so some GSM TracFone will be able to access their towers, but T-Mobile is different, some are TDMA. Many have left ways to unlock their devices. UK Mobile Unlocked, which sells unlock codes to consumers, says unlock code sales have increased 71 percent.