WAP

Wireless Application Protocol (commonly referred to as WAP) is an open international standard for application layer network communications in a wireless communication environment. Its main use is to enable access to the Internet (HTTP) from a mobile phone or PDA.
A WAP browser provides all of the basic services of a computer based web browser but simplified to operate within the restrictions of a mobile phone, such as its smaller view screen. WAP sites are websites written in, or dynamically converted to, WML (Wireless Markup Language) .

Some of the applications such as:
Email by mobile phone
Tracking of stock market prices Sports results
News headlines
Music downloads