How to Unlock iPhone 3GS on iOS 6.1.2 with 06.15.00 Baseband
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addinol • February 21, 2013 at 4:13pm
I updated my iPhone 3GS from iOS 6.0.1 to 6.1.2 and lost my network connection. The device shows No Service even though it was previously unlocked. I am currently using the 06.15.00 iPad baseband.
Answers
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iClarified • January 12, 2026 at 7:17pm
To unlock an iPhone 3GS running iOS 6.1.2 with the 06.15.00 iPad baseband, you must use a combination of RedSn0w and ultrasn0w. First, download the iOS 6.0 IPSW for the iPhone 3GS. Even though you are on 6.1.2, RedSn0w 0.9.15b3 requires the 6.0 firmware to identify the device correctly. Open RedSn0w, go to Extras, click Select IPSW, and point it to the iOS 6.0 file. Return to the main screen and click Jailbreak. During the process, ensure Install Cydia and Downgrade from iPad baseband are selected. Downgrading to baseband 05.13.04 is highly recommended as it is more stable and allows GPS to function. Once the process is finished and your device is jailbroken, open Cydia and add repo666.ultrasn0w.com to your sources. Install ultrasn0w and restart your device. Your iPhone should now pick up a cellular signal.
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aniel • February 24, 2013 at 3:06am
You can unlock your iPhone 3GS on iOS 6.1.2 by following these steps:
1. Restore your iPhone 3GS to 6.1.2 via iTunes.
2. Use RedSn0w 0.9.15b3 to jailbreak. Go to Extras, select the iOS 6.0 IPSW (required for identification), and then click Jailbreak.
3. Select the option to install the iPad baseband if you do not have it, or downgrade it if you want GPS back.
4. After completion and activation, open Cydia.
5. Add the source repo666.ultrasn0w.com and install the ultrasn0w package.
6. Reset your network settings and your signal should return.
1. Restore your iPhone 3GS to 6.1.2 via iTunes.
2. Use RedSn0w 0.9.15b3 to jailbreak. Go to Extras, select the iOS 6.0 IPSW (required for identification), and then click Jailbreak.
3. Select the option to install the iPad baseband if you do not have it, or downgrade it if you want GPS back.
4. After completion and activation, open Cydia.
5. Add the source repo666.ultrasn0w.com and install the ultrasn0w package.
6. Reset your network settings and your signal should return.
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slash3r • February 28, 2013 at 9:59am
If your iPhone 3GS is on baseband 06.15.00, it is recommended to downgrade to 05.13.04 using RedSn0w. This version is fully compatible with ultrasn0w and restores GPS functionality which is often broken on the iPad baseband. After downgrading, install ultrasn0w from Cydia.