The iPhone comes with a number of ringtones you can use for calls and ... You can use almost any audio file in AAC format, with the file extension changed to .m4r, and a maximum length of 30 ...

Change the M4A extension to M4R ... If you need to remove a custom ringtone from your iPhone, simply connect the iPhone to a PC, click the device icon in iTunes, navigate to the Tones tab in ...