what carrier does onstar use
OnStar currently relies on Verizonâs CDMA digital network to provide a car phone and slow speed data network to share vehicle diagnostics and enable certain remote functions. Current vehicle owners can continue to use OnStar services delivered over Verizonâs wireless network. But starting in mid-2014, most new Chevrolet, Buick, GMC and Cadillac models will be equipped with AT&T 4G LTE service instead. In Canada, OnStar will continue to rely on Bell Mobility.