How to Unlock iPhone 4S, 4, 3GS, 3G baseband on iOS 4.x or iOS 5.0, 5.0.1, 5.1, 5.1.1 or the Upcoming iOS 6 and some notes before decided to Update to any iOS and the ability to preserve baseband before Update your iPhone.

What’s meaning By Baseband

How to Unlock iPhone 4S, 4, 3GS, 3G baseband ? Before we talk about baseband you have to know the definition of baseband: iPhone baseband is essentially the cellular modem firmware on your iPhone, upgrading baseband is to improve the functionality of the cellular modem and also to keep the device locked to the intended carrier.

This is why iPhone unlocks are updated to different baseband versions while updating their firmwares, since ‘hacking’ the baseband is necessary to allow the jailbreak and unlocked iPhone to utilize the cellular modem on the phone, there by allowing call, data, and SMS transfer to occur on the device.

How to know your baseband

In order to know your baseband version or Modem Firmware go to “Settings”  –> “General” –> “About”–> “Modem Firmware”

Unlock iPhone 4S, 4, 3GS, 3G baseband :

iPhone 4S Basebands

01.0.11  (Unlock Solution using GEVEY™ Ultra S)

01.0.13  (Unlock Solution using GEVEY™ Ultra S)

01.0.14  (Unlock Solution using GEVEY™ Ultra S)

02.0.10  (Unlock Solution using GEVEY™ Ultra S)

02.0.12  (Unlock Solution using GEVEY™ Ultra S)

iPhone 4 Basebands