You'll be able to use EDGE with the N95 on both T-Mobile and Cingular, since the N95 is quadband GSM. The N95 only offers UMTS 2100, which is only available across the pond. To get 3G speeds on Cingular in the US, the N95 would have to have UMTS 1900 (which is different from GSM 1900).
Does...