This letter shows they're definitely a little panicked about that. >> how will people that have been kind of curious about their iphone and what it's been doing, george's wife is one of them, what's wrong with my iphone, how will you know if this is how you're being affected if this is the situation? >> reporter: it's only certain iphones. they're looking at iphone 6 and later. if you have an iphone 7 and later you shouldn't really be experiencing too much of this problem, at least not yet. it could come up in the future. you can definitely go to an apple store and ask them to check, you know,...