Basically BIO messages are data messages, it is important for receiving data messages like ringtones, logos, vCards, vCals, e-mails etc. They can also used for sending text message which can be interpreted in a particular way. The standard messaging MTMs is usually used for text messages, but for data messages BIO messages are more suitable.
For using BIO messages, we need to define BIF (BIO Information File), which defines the UID of the BIO message and contains information about the parser and BIO control to be used for the particular BIO message type.
The articles describes what is the BIO messages and how it works. BIO messages is bit complex topic and might be hard to digest for beginners, but it is very important for those who is interested in data messages.
--kamlesh sangani 14:27, 8 September 2009 (UTC)