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The community voice is one of extreme importance.  Put yours to work by contacting the Sonic Headquarters and letting them know you miss your Sonic!  The phone number is 1-866-657-6642 (1-866-OKSONIC).  This will direct you to Customer Service, select option 1, and happily tell them how much your Sonic is missed.  They will collect very simple information from you for their records including first/last name, day/evening phone number, email, and physical address.