Nokia

Will i be able to take my regular gsm sim chip, and use it with the up and coming USA N80 version. What issues might I have?.. I guess i wont be able to use video calling.. unless Tmobile uses cingulars 3g Networks?..

also I was considerig the LG CU230 phone, but im not sure if my sim card will work in it, or if i need to buy one unlocked or something..also they speak about it having a 3g sim card..again i wonder if T-mobile has a 3g card up and coming?

Thanks