How 2G network work?

---3G Network--- The third generation (3G) network provides very fast data access to the phones. You should be able to enjoy stream audio/video contents on a 3G mobile phone. But the availability of 3G phones and services is still limited. For PDAs, the story is much simpler. Unlike mobile phones, PDAs do not require subscription-based network services. They are standalone minicomputers, pretty much like PCs before the internet.