Iphone4s SMS ringtone card

I've had this problem before. I'll give you some solutions to see what caused your machine.

Solution: 1, in Settings-General-Restore-Restore all the settings (see all the settings clearly, not the contents, please see them clearly).

2, restart the phone can generally be solved.

3, there is the plug-in Move2Unlock installed, which can be uninstalled.

I hope I can help you.