I was trying to make a mockup in Balsamiq for a windows phone 7 series application and thought i needed a few items to get things right. So I started creating the parts needed. The basic phone, with a see through-screen so it's easy to create panoramas to lay behind. The keyboard variants (there are quite a few, default, text, email, web, search and a couple of dialer keyboards) and then a few of the buttons and checkboxes that’s needed. Most buttons are easiest mimicked by using the geometric shape in Balsamiq.

It’s quite heavy with all the details in the keyboards so pick and choose only the controls you need.

So there you are, just download and start using it.