You need to go to the T-zones data configurator page on
Unsupported Browser 's website and have the settings sent to your phone (for free). You'll have to input your phone number to do that. It's normally included with a T-Mo phone, but since you bought unlocked, you need to do this to get T-zones.
Yeah, 773 isn't that far from me, but definitely far from your swamp! They should be able to fix that for you - the guy probably just miskeyed it when he was inputting your information.
How do you like your C261?