Im not sure what phones support what but I know the GSM phones that are new to the US are the ones that are best for web browsing with GPRS data technology. Just be carefull when using the service as they will charge you insane ammounts of money unless you get a package deal. Ive seen some that were 10 Cents per Kilobyte of data. My friend didnt know this and he had a blast messaging with a girl from college he was interested in... that was until he got a $280 phone bill. I use ATT and have the mMode plan for 1Mb of data per month for $7 this allows me to check my e-mail if needed and mayge grab a ring tone or a game but the ringtones and games eat up most of my data so I try to just get it sent from the web site if possible in an SMS or MMS
Also, im fairly certian you have to have the newer GMS phones to use the web. In the EU they call it WAP technology. I have a Motorola V60I right now but it cannot get on the web and such so I am switching to a Nokia 6800 which can
-: phenious :-