i have managed to make Du work on EDGE setting by entering the following
settings > general > networks > EDGE
APN : Du
username : Du
Password : Du
it works perfectly ,
and some1 earlier had asked how to disable EDGE automatic loging in
go to
Settings > WiFi networks > ask to join networks
choose OFF ( you will have to manualy select a network to connect to)
while if it was ON ( it will automaticly fitch the network and ask if you would like to connect)
im not 100% sure , i will make sure and let you know