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Verizon "roams" through out the united states, but primarily uses Verizon. They do not have a contract with anyone but Verizon. SO when you are not in a verizon area, and say on another CDMA carriers location, that call is $$$ for onstar. That's why onstar is fairly expensive.
Anyone who owned a cell phone before there was "no roaming/nationwide" plans should remember how expensive roaming was.
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