Some users faced a problem on iPhone 3gs and iPhone 4 after jailbreak iOS 4.3.1, the problem was No service after ultrasn0w 1.2 baseband 06.15.00 on iPhone 3GS and 01.59.00 baseband on iPhone 4. Now you can fix this problem by following the below steps.

Step 1: Open Cydia on your iPhone 4 or 3GS

Step 2: Go to Manage->Sources

Step 3: Now tap on “Edit”, then tap on “Add”

Enter the following repo
Now tap on “Add Source”
Step 4: Tap on Done.
Step 5: Tap on and install

Step 6: After the installation Go to again. Now scroll down and look for “Ultrasn0w fixer for 4.3.1” Tap on it. Install the package. It will ask you to reboot your device.



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