When I am on a call and holding the phone to my ear, my ear touches things on the screen. First I muted myself and the caller on the other end kept saying he couldn't hear me. Later that day, I realized my ear touches the mute key. So I make sure I am out of that screen and then my ear touches numbers on the number pad so I go to the main screen and my ear makes all the little icons wiggle; then I go to the phone search page and my ear some how clicks a d and I have now searched my phone for every d in it. I have tried to lock the screen when on the phone, but it seems that only works if I am on the speaker phone; otherwise it hangs up. I don't think I have big ears . There must be some option I can use so this does not happen. People do not seem to be able to hear me when I am on the speaker phone and they don't particularly like my blue tooth (though I use that in the car anyway).