The user agent of your windows phone 7 should be fixed and you can only discover it from your phone. You can dynamically get the user agent from your phone directory.
The User agent code will be something like this
" Name" | Microsoft Developer Support | Windows Phone 7
If suppose you are finding any difficulty is locating this user agent code then you can refer to the guides regarding choice of your user agent.
Designing Web sites for web browser| Microsoft Developer Support | Windows Phone 7.
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