How do I stop my phone from muting or opening apps accidentally while on phone?

[taspillers4]

I have a problem with accidentally muting calls or accidentally opening new apps when I am on the phone. I seem to bump things while talking. It annoys me to end a call and find some application open that I did not intend. It also is annoying to hear someone going hello hello are you there.. then I have to unmute the phone because I have accidentally bumped the mute.