Do you know 3g ? If no search the term '3G' . It is third generation mobile network. Many service providers upraded their base to 3G. (foreign countries ) But india does not. Data calling speed in indian mobile networks is too low now. So, many of them are not gives several value added services.
EDGE GPRS networks gave remedy to many problems. Now an indian can listen online radio, stream videos like youtube and browse world wide web through his handheld mobile device.