A phone only rings when a special “ringing signal” is sent to it. For regular telephones, the ringing signal is a 90-volt, 20-hertz, AC wave generated by the switch to which the telephone is connected. For mobile phones, the ringing signal is a specific, radio-frequency signal.

Bollywood Ringtones are available in the following formats:

1. eMelody – Older Ericsson format.
2. iMelody – Most new phones that don’t do Nokia’s Smart Messaging are using this format.
3. kws – Kyocera’s ringer format.
4. mid / midi – Popular sound format.
5. morse code – Text files with a .morse extension get converted into morse code songs
6. mot – And older ringer format for Motorola phones.
7. MP3 – Some phones support ringtones that are mp3 format.
8. nokia / sckl / ott – Nokia Smart Messaging format. Nokia phones can receive ringtones as a text message. Ringtone tools can create these text messages. This allows anyone with a compatible phone to load their own ringtones in without a datacable. There are other phones besides Nokia that use this.
9. pdb – Palm database. This is the format used to load ringtones on PDA phones such as the Kyocera 6035 and the Handspring Treo
10. rtttl – A popular text format for ringtones.
11. rtx – Similar to rtttl with some advanced features. Also the octaves are different on rtx.
12. samsung1 & samsung2 – Samsung keypress format.
13. siemens keypress – Can create and read in a Siemens text file format.
14. siemens SEO – Siemens SEO binary format.