I had OnStar on my Chevrolet Avalanche. It comes in handy for emergency communication. We rarely, if ever, encountered an area where it wouldn't reach a tower. We used it alot when neither of our cell phones had service. It's just too pricey to use full time and having to recite the numbers to be dialed can be a pain. The system has a tough time hearing what you're saying with road noise. You also can't call any automated services where you're required to "press 1 now". There's obviously no keypad. But, if you're real lazy with money to burn, the thing will pretty much babysit you. For a hefty fee It will give you directions, make dinner reservations for you and tell you you're not a bad person.
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