in the status I've a sign of the TTY always sign on, how can I turn it off?
Copied from page 156, iphone_user_guide 5.1
Thanks, but when I go to: settings>phone, there in nothing about TTY,
In the setting>phone, I've only:
Show my caller ID:
International assist (on/off)
That's all I got in my device, so what shall I do?
Is your phone jailbroken? If it is not, your iOS firmware is seriously corrupted. You should connect to iTunes and Restore the phone.
Thanks, no its not jailbreaked, but the problem that we don't have apple stor in Libya yet!!
If it is not running modified software, you should set it up as new device without using the latest backup, as suggested by Lawrence Finch.
How to back up your data and set up as a new device
Retrieving data ...