DO NOT BUY these following APP's
1. Camera Timer Pro by Droid Mobile Software.
2. Camera Timer Premium by Droid Mobile Software.
I purchase the Camera Timer Premium few weeks ago for my 9850/7.1.0.755. It was successfully installed to my BB, but when I tried using it, the APP do not work. I have been sending email to the developer looking for answers on how to resolve my concern but the developer have not responded to any of my emails.
Do not waste your time and money on the app mention above.
Here's a great Camera timer app that will work and its free. http://appworld.blackberry.com/webstore/content/34301