Yes I have the manual for the router, Netgear WGR614 v9, and have tried before to access it and tried the factory reset et al with no joy.
But this particular problem I don't think is router based, other laptops when used on my network record upload speeds of 450 kbs, so why only 260 kbs for the iPhone ?
Someone else must have the "Speedtest" free app, I just wondered if anyone is getting better than 260 kbs UPLOAD speed on their iPhone 3GS.