Ontera Customer Service Phone Numbers Customer service: 1-888-566-8372   Ontera Headquarters Info, Email, Phone number, Website and live chat Information Formerly: called O.N.Tel, O.N.Telcom Type: Subsidiary Industry: Telecommunications Founded c. : 1902 Headquarters: North Bay, Ontario   Ontera is a telecommunications company in Ontario, Canada and a subsidiary of Bell Aliant. It provides local telephone service in