Open Cydia.
1) Click the "Changes" tab in the footer.
2) Press the "Refresh" button in the top left corner.
3) After "Reloading Data", perform a search for "p0sixspwn" (the O is a zero).
4) Tap Install.
5 After installing p0sixspwn your device is untethered
6) Install ultrasnow 1.2.8( u can use iphone yeta,
repo666.ultrasn0w.com or iphone folders any other methodes)
7) Restart your device enjoy
**Rather than using PuTTY for terminal on windows, a better solution would be to use mobile terminal on your apple iphone.**
Go to Cydia
Go to Cydia tab in footer
Scroll down and click "Open SSH"
Scroll down and click on "Change Default Password"
In Option C, you'll find mobile terminal. Click on it.
Install mobile terminal
Exit Cydia and open mobile terminal
You don't have to type the ip address. Type
iphone:~ mobile$ **su root**
The default password is alpine (it won't be visible when you type. Hit return after you've finished
Use the following if you are trying to solve NO SERVICE error in untethered mode
root# chmod 755 /var/mobile/ /var/mobile/Library/ /var/mobile/Library/Preferences/
Exit mobile terminal and go to setting > general > reset > reset network settings
Let the phone reboot itself.
Follow this after the above steps
http://sirajgonjtel.blogspot.in/2014/01/iphone-3gs-613-no-service-100-work.html