Service Guarantee - National TeleCom, a telecommunications broker since 1990, continuously researches numerous carrier and reseller services. Using criteria based on real time, real savings, and friendly responsive customer service, NTC has rated the listed companies highest for performance and overall customer satisfaction. The list is continuously updated based on each companies' performance.  Should any customer be dissatisfied with their service (for whatever reason), National TeleCom will switch that customer to another carrier of their choosing at no cost.