My 10 charges my 4S just fine with no messages or issues.
The NAVI isn't the best, you can do way better aftermarket and take out the crappy stereo at the same time. I just love the fit of it in the dash and I hate the little glovebox that's there if you don't have NAVI. Works great with the backup camera too (Forum member designed to work perfectly with the factory NAVI).
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