In a recent article I’ve made a step by step tutorial on how to unlock your iPhone 4 on iOS 5.0.1 with Gevey Sim.
We all know an iPhone 4 which is unlocked with Gevey Sim is not 100% as an factory unlocked iPhone 4. FaceTime might not work and iMessage as well, but as long as 3G speed is good everything is OK.
This article reffers only to those who have an iPhone 4 that is unlocked with Gevey Sim and have 02.10.04 baseband. So, if you unlocked your iPhone 4 with Gevey Sim on baseband 02.10.04 and you see only one (1) signal bar, don’t worry it’s fixable. Though you can use your device with this ‘issue’ but you might want to know a sign from your signal bars.
This is what you need to do:
Step 1: Pop out the sim card and backup your iPhone 4 content with iTunes!
Step 2: Restore your iPhone 4 to iOS 5.0.1, but BEWARE! PRESERVE YOUR BASEBAND!!
You can create a custom firmware which keeps your current baseband version, with RedSn0w 0.9.10b1.
Step 3: Go to Cydia and search for UltraSn0w
Step 4: After you install UltraSn0w, insert your sim card togheter with the Gevey Sim and follow the steps as usually.
Now your iPhone 4 unlocked with Gevey Sim on iOS 5.0.1 with 02.10.04 baseband should work properly!