[drummerman2008]

I have the blackberry storm 9550 and I wanted to what's a good app that will lock my phone while I'm on a call cuz my cheek push buttons.

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[linuxdaemon]

The 9550 has a proximity sensor, your phone's screen should lock when it is up to your ear. There are apps that lock the screen though. I am most familiar with StormSlider/BerrySlider. though honestly I only had luck with that on my 9530 and not so much with my storm2. There are quite a few other lock applications that offer call screen locking (PatternLock, UltimateLock, SwipeLock, etc)

[trek750]

Try TalkLock, from CellAvant. They make great products. I used to use this app when I had a Storm, it worked great.

TalkLock (TM) - Utilities BlackBerry Apps

[SCrid2000]

PhoneTweak by SwooshSoftware does.
PhoneTweak - Utilities BlackBerry Apps - Crackberry BlackBerry Apps Store