12-20-2012 07:47 AM
Welcome to BlackBerry Support Forums
Please Check those Knowledge Base first.
KB31531 : BlackBerry 7 smartphone may feel warm during use.
KB14320 : How to maximize battery life and free memory on the BlackBerry smartphone.
But if you really thing and sure that your device it getting as much as 50'C then you can contact your Service provider to know them about the issue you are having.