Well I just got back from the Cingular Store (And to answer my own question earlier, yes it's now a Cingular store with a "Cingular" Sign now). Anyways, I learned that Cingular doesn't have roaming charges (I bet you all knew that though ), so that's pretty cool. I never knew that. I guess its pretty obvious that I don't know much about Wireless Carriers . So what's Roaming exactly? Is that when it shows on your phone, say in this case you have Cingular Wireless, but on the phone it says T-Mobile? Because you're roaming on their network because the signal is better? Anyways, No Roaming Charges and Rollover minutes are a big plus. And the phone! The Nokia 6620 looks huge online, but I saw it, that is pretty small, that's a good thing!
You are exactly right about the roaming part. Most of the time when your phone switched over to T-Mobile or another GSM network, it is because there is not Cingular signal present. There are a lot of times when the T-Mobile or other signal will be stronger than Cingular, and vice versa, but the Cingular signal is still strong enough to hold the call well...