my tmo phone now says cingular?!?!?!

is there a way you have to be set up to roam on cingular? i've had dead areas where i can't get a tmobile signal, but there is cingular, but i still get nothing. even if i force it to cingular, it never connects.
 
hey alittle off topic but does anyone know how to change that and place whatever you want on it. instead of tmobile change it to lets say my naem or something
 
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