What type of media you use to send multimedia messages?

Multimedia Messaging System (MMS) is the logical evolution of the Short Message Service SMS, a text-only messaging system for mobile networks. MMS-enabled mobile phones enable subscribers to compose and send messages with one or more multimedia (digital photos, audio, video) parts

The MMS data flow starts with a subscriber using an MMS client on the mobile phone to compose, address, and send an MMS message to one or more recipients. MMS addresses can be either E.164 phone numbers (e.g., "+18005551212") or RFC 2822 e-mail addresses (e.g., "you@yourdomain.com").

some examples of services on MMS?

Taking a snapshot via a camera phone and sending to a friend

Receiving cartoon strips

Composing your own animated picture messages and sending to friends

Sending audio files

Sending pictures & audio files with simultaneous playback

Advertising

Music download & play (really with 3G)

Storing pictures to an on line album

Remote surveillance