This machine can't send short messages. After entering the information, you will return to the desktop, and after deleting the message, you will exit the message and enter again. Still exists.

Did you enter the system after jailbreak? Did you delete any system files by mistake? Is your so-called recovery system directly restoring the factory settings?

If you have deleted the system files, it is still useless to restore the factory settings.

If you are IOS5, upgrade to IOS6 and update the system.

If you are IOS6.0. 1, it is the latest version and cannot be updated. You need to download the system file of IOS6.0. 1 from Apple's homepage, then connect to itunes, hold down the SHIFT key, and click Restore in itunes. At this time, file selection will pop up, select the downloaded IOS6 system, and update the system.

Note: you can't downgrade now, and you can't use a flat brush. You can only upgrade to IOS6. As for prison break, you should be released early next year.