How to Unlock iPhone 4 on Modem Firmware 04.12.05
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tlw1958 • June 14, 2013 at 1:49pm
I have a second-hand iPhone 4 (not a 4S) locked to the 3 network with modem firmware 04.12.05. I am looking for instructions on how to unlock it for use with other carriers. Is there a tool like Redsn0w that can perform a software unlock for this specific baseband version?
Answers
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iClarified • January 13, 2026 at 7:03pm
The iPhone 4 modem firmware 04.12.05 cannot be unlocked using software tools like Redsn0w or UltraSn0w. These software exploits were only compatible with much older baseband versions. To unlock an iPhone 4 on 04.12.05, you must obtain an official IMEI unlock. The best approach is to contact the original carrier the phone is locked to and request an official unlock. Once the carrier processes your request, you can complete the unlock by connecting the iPhone to a computer running iTunes. Note that jailbreaking your device will provide access to unauthorized apps, but it will not remove the SIM restrictions for this firmware version.