Are there any (hidden) diagnostic tools available on Nokia Windows Phones (or Windows Phone in general)?
On Nokia devices,
Once opened for the first time, the tool will be listed in the applications list as "Diagnostics".
There's also a (Nokia) data field test can be accessed by dialing
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There is a WinPhone Info Free App available in the Windows Phone Marketplace at: http://www.windowsphone.com/en-US/apps/48eddb9a-ca83-e011-986b-78e7d1fa76f8?wa=wsignin1.0
Its description is:
As I write this, it is rated 4.5 stars on 255 ratings.