The OnStar module has a radio board on it that connects to cell services, it is receive only from the satellites. The wifi signal in your car is part of the radio/entertainment system and separate from the OnStar module.
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1978 Z28 T-Roof
1984 Berlinetta
2007 Solstice Supercharged
2014 C7 Z51
2020 RS Convertible
2023 2SS Convertible
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