What is iPhone Unlock

Unlocking : Unlocking your device means to open up the iPhone’s modem to accept SIM cards from unofficial carriers. For example In the US, iPhone will not connect to any carrier other than AT&T, unless it is unlocked. Should you want to use your iPhone with another GSM carrier, you need to unlock. Just as iPhone OS controls the applications that you interact with whenever you use your phone, the baseband processor controls the modem. The baseband processor has its own, separate firmware from the main OS, called the baseband firmware. During most iPhone software updates, Apple update the baseband firmware on the device. The unlock lies in the baseband firmware, by patching out certain bytes, you can bypass the SIM check. For some devices, updated basebands can mean the inability to software unlock your phone.

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