- Go to Settings -> General -> Network -> Edge
- For the APN, type mobitel3g (don't mind the '3g' part. This is the network name they are using)
That's all. No user name or password is needed. Now try going to safari and opening a web page.
GPRS/EDGE signal indicator
On the status bar, if you see a rectangle to the right of signal bars, that means you have GPRS. If there's an 'E' on it, that means you have EDGE signal.