Previously I mentioned in my posts to unlock iPhone 4S on 5.1 and 5.0.1 using UltraSn0w 1.2.5 and by using Gevey Ultra SIM but these two iPhone unlocks were not compatible with all basebands. There is one other unlock method for iPhone 4S, the R-SIM, that can unlock iPhone 4S baseband 2.0.10 on iOS 5.1 hassle free. There are many people who has updated iPhone 4S to iOS 5.1 but not able to unlock by any other mean for iPhone 4S carrier unlock, they can use R-SIM III to carrier unlock iPhone 4S.
This iPhone 4S unlock is also compatible with other basebands but only for ios 5.0 and 5.0.1. Other basebands include 1.0.11, 1.0.13, and 1.0.14.
R-SIM III unlock is very easy to implement and any person who does not want to jailbreak or dont have much knowledge about jailbreaking and unlocking, he can easily unlock iPhone 4S by using R-SIM 3.
Other features of R-SIM III are mentioned below:
1. No Need to Dial International Emergency Number 112
R-Sim True Plug-and-Play Unlocking SIM Interposer
Complete Unlock with all 2G and 3G data services
Untethered Unlock with no Jailbreak Required
Compatible with all GSM iPhone 4S SIM Cards
No SIM Card Cutting or Physical Modifications
Works on iOS 5.0, 5.0.1
Works on Baseband 1.0.11, 1.013, 1.0.14
Guaranteed Better Reception than Previous
Decreased Power Consumption
Watch below video for further details and understand how R-SIM 3 works.
You can visit below link for more details, pricing and ordering of R-SIM III Unlock for iPhone 4S.
Ultrasn0w Fixer has been released by a person, zmaster who released modified Ultrasn0w Fixer that enables the old Ultrasn0w 1.2.5 to unlock iOS 5.1 but there are sitll some limitation as far as baseband is concern so it supports the below basebands only:
Note: T-Mobile USA users have to disable 3G network before starting unlocking iphone Go to Settings >General >Network and switch the “Enable 3G” switch to OFF.
Remember your device should be Jailbroken so that you can use Cydia for unlocking using UltraSn0w 1.2.5, you can visit this article to jailbreak now.
Steps for Unlocking are:
Step 1: Tap Cydia icon to start the application and tap Manage after Cydia loads.
Step 2: Tap Sources
Step 3: Tap the Edit tab as shown in below screen
Step 4: Tap the Add Button
Step 5: Type following URL and Tap Add Source
Download of Cydia source will be done automatically. After the source is successfully added to the Cydia tap return to Cydia button at bottom of the screen and then tap the Done button. You will find the Ultrasnow Fixer utility in the list of sources in step 3 install it and wait till it complete the process. Go back to Cydia.
Step 6: Now you will be in the main window of Cydia if not just open it and tap Search at lower right corner. Now type Ultrans0w in Cydia search box as shown below and tap the ultrasn0w 1.2.5 as shown in below screen.
Step 7: After tapping you will see the below screen now tap Install and tap Confirm on next screen. The installation will begin and complete itself.
Step 8: Reboot your device.
Congratulations ! your device is unlocked on iOS 5.1 try using the different SIM cards.