How to Unlock iPhone 4 on iOS 5.1.1 With Baseband 4.12.01
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gene123456 • October 24, 2013 at 7:24pm
Is there a software unlock available for the iPhone 4 running iOS 5.1.1 with the 4.12.01 baseband, or are there other options besides using a G-Mate adapter?
Answers
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iClarified • January 14, 2026 at 3:37am
There was never a software unlock released for the 4.12.01 baseband on the iPhone 4. Tools like Ultrasn0w only supported older modem firmware versions. For an iPhone 4 with this specific baseband, the only way to permanently unlock it is through an official IMEI unlock. You should contact the original carrier to see if they can authorize an unlock, or use a reputable third-party IMEI unlocking service. While hardware adapters like G-Mate were used as a workaround at the time, an official carrier unlock is the only reliable method for this device.