Is this something to deal with Jailbreaking? Because as far as I'm aware you can only turn 3G on/off and don't have any control over EDGE.
Also the reason you'll only connect to GRPS with EDGE turned on is probably because you're not with Telstra, and therefore can't get EDGE.
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MacBook Pro 2.66ghz 4GB RAM 320GB HDD
Black iPhone 3GS 32GB
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