iPhone baseband is essentially the cellular modem firmware that is on your iPhone. You’ll probably have heard of baseband upgrades, the purpose of these upgrades is to improve the functionality of the cellular modem and also to keep the device locked to the intended carrier (in the USA, this is AT&T).
This is why iPhone unlocks are updated and specific to different baseband versions, since ‘hacking’ the baseband is necessary to allow the jailbreak and unlocked iPhone to utilize the cellular modem on the phone, thereby allowing call, data, and SMS transfer to occur on the device.
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