Phone button on 2008 f150
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the phone feature has to be unlocked in order to use it. if you hold 3 and 6 on the radio at the same time it sends you in to a menu were you can check whats unlocked. i have no idea where to get it unlocked at. been searching. hope this help. i just bought the i simple for my truck. works fine. but i might be selling it with the radio. lol i like the new kenwood dnx9990hd. my cousin has it and i like it.