We had AT & T no roaming/no longdistance nationwide plan. When Cingular bought them, we switched. The coverage is excellent(our friends have Sprint and experience areas with no reception), but that depends on where you are. Unused minutes rollover to next month. We had an initial billing problem, but it was resolved through Cingular customer service. We have two additional lines for $9.95 each. We couldn't add any lines with our AT & T service.