Since you usually have to manually input the GPRS settings, it actually should not matter that you don't have a data plan. The WiFi should work fine for surfing the web. I really don't recall how AT&T treats their MMS messages, if they treat them as messages (which is how I think they do it), then you may have to put in the MMS settings. If they treat them as data downloads (like Verizon does) then you're out of luck.
I'm on my second unlocked phone (HTC s710) Everything but the internet and mms worked as soon as I installed the sim card. The WiFi setup easy. It did take me a while to find AT&T's GPRS (internet) and MMS settings. Congratulations for freeing yourself from AT&T's grip. I've never used S60 before, but I can't imagine it would be different from WM 6 as far as setup.
My company has provided me a new phone on below plan. The phone is a basic Nokia and I want to upgrade with an unlocked N95 or Sony K850i
but I'm guessing I won't have any of the internet features as I don't have an internet plan.
What can I expect to get with an unlocked phone on below plan ?
If I get a phone that has wifi can I upload pictures and media from the phone directly to the net ?
Will the Wifi work on the phone regardless of the plan I have with AT&T ?
Phone Plan Ordered:
Best Business Pooled Nation $64.99
AT&T Basic Features
Night & Weekend Unlimited
Unlimited Mobile to Mobile Calling - Nation
AT&T World Traveler