Problems similar to others

[722ish]

I have been reading about all the different problems, and I am not sure mine is exactly like anyone else's..

I just purchased a 3g iphone on saturday, after having a V1 phone since last august. My girlfriend has a v1 phone as well, for about 4-5 months now.
All the phones pick up the wireless network within my house, and connect with the wep key. It is a D-Link router used in the house.
My desktop and all phones have a full signal anywhere within the house.

Both the V1 phones will stay connected while using the internet, but the 3g phone will show the signal strength, but disconnect back to edge any time i try to access the web.

Is there anything i can try to do?

[722ish]

so i reset all network settings again, and yet, nothing changes...

anyone with any ideas??