Custom ringtones - definition
Phones come preloaded with a selection of ringtones, yet some phones also allow the user to load a new ringtone. This could be done by writing the notes in a built-in composer, or by downloading the ringtone via a special SMS/MMS or from the internet.
An easy way to transfer custom ringtones to your mobile phone is via a USB data cable, Bluetooth or a memory card reader.
When you want to use custom ringtones, you should check the phone supported file formats beforehand.