As of 2015, customers can check the balance of a MySonic card by visiting the Sonic website. Enter the My Sonic portal and click the Cards tab. Enter the card number and card pin number as directed. For additional questions, contact Sonic Customer Support.
Sonic was founded in 1953 by Troy Smith and Charles Pappe in Shawnee, Oklahoma. The chain has grown to more than 3,500 Sonic restaurants spread across 44 states. Most restaurants are independent franchises. However, Sonic World headquarters is located at 300 Johnny Bench Drive, Oklahoma City, Oklahoma. The chain continues to expand and open more franchises throughout the United States.