While looking for a hint of interop unlock on a Dell Venue Pro device (running Windows Phone 7), I was working with the Engineering Mode application. One of the capabilities it offers is an AT command execution layer. While follwoing the list of Motorola-based commands, I selected a few that yield actual results.

These are commands that create instant results. You can also use commands that are more complex and require sequential input - those can be used to send text messages, for example. Coupled with OurCOM.dll these can be used to read various phone information directly from an application that can access interop capabilities.

In order to get to the AT command layer, follow these steps:

1. Type ##634# in the dialer to unlock the EM application.
2. Double-tap on the empty part of the grid.
3. Slide down the hardware keyboard and type qwertyuiop.
4. Click on Protocol.
5. Type in *#6336#.
6. Select TMO.
7. Select AT_COMMAND.

You can test most of the commands there. I will keep this page as a general reference, and as I find out more commands that work, I will update it.