How to disable the mute button on an iPhone when on a call?

So many times when I'm on a call, my ear will tap against the screen and inevitably hit the mute button so the other person can't hear me. It's actually unbelievably annoying. There should be an option to just lock all options on the screen while on a call if you want! I've a 3GS, is there a way to disable the mute option when on a call?

No there's not, but your phone should auto lock when the proximity sensor detects it getting closer to your ear. If it is not doing this properly then your best bet would be to take it into an apple store to get repaired or replaced. But that is the only way to lock the options on the screen.

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