I can only give you the setting that work for my phone with AT&T, however the full details are on the AT&T Wireless Website. Just search for Siemens SX56 GPRS Settings.

Here is what I have:
New Connection Called GPRS
Modem is Cellular Line (GPRS)
Baud Rate is 115200 Windows should adjust this to whatever it needs to, so I just chose the highest one.
Access Point Name:
proxy

That shoud be it.
I can connect to the internet with these setting wirelessly and download items as well.

Hope this helps.
Jim Chalil

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Thanks and have a Great PDA!