No, you can't do both voice an data (email, broswer, sms) at the same time. I believe it's that way with all devices - but I am not sure about WiFi devices.
all that sucks. well right now I have the i870 so if I get it could I just put my sim card in and it would work? also whats this about it doesnt support SMS will I not be able to text?
7100i can text message and its a very reliable source to do so. Its just that its expensive. Instead of texting through the phone it all goes through data. you have to get a data package in order to text and those can be expensive.