Ever since the Windows Phone operating system was upgraded 7.5 (also known as the Mango upgrade), you can use custom ringtones on a Window Phones, but for Windows Phone 7.5 devices, there are some very specific requirements that must be followed in order to use custom ringtones, namely the ringtone audio files must:
- be in MP3 or WMA format
- be less than 40 seconds long (make it no longer than 39 seconds to be on the safe side)
- be no larger than 1 mbs
- not be protected with digital rights management (DRM)
- be assigned to the RINGTONE genre in its metadata
With these requirements in mind, you can create ringtones from your favorite tunes or you can download already formatted ringtones and sync them to your phone.