A refugee from the Symbian world, PhoNetInfo's mission in life is to delve into an operating system's APIs in as far as they have to do with hardware, and report back everything that's found. It's a paid-for utility (with a pane-limited trial) and the information is still somewhat sparse, but in most cases that's the fault of Windows Phone itself, so hopefully both it and this utility can advance from this point onwards. See below for the information that is reported.

From the Windows Phone Store description:

PhoNetInfo retrieves detailed technical phone and network information such as firmware version, device name, battery status, power saving status, network operator, roaming status, wifi/wap interface names, camera details (e.g. ISO, white balance), number of CPUs, CPU architecture, CPU features, CPU page size, CPU frequency, high performance timer frequency, time since last device reboot, RAM and ROM, web browser user agent, etc. All information can be exported by email and the application's language can be changed at any time.

The interface is super-simple - so far, there are only a few things listed that I wouldn't know from other sources, but hopefully the APIs will get extended by Microsoft and then PhoNetInfo will improve further.

Here's the utility in action:

Much of this information is available in Settings on Windows Phone - but not all. Though 'Discharge time' looks odd - this phone was charged four hours ago, so I wonder what this is reporting....

Minimalist in UI, the option to export data by email could be very useful in helping someone else support you or diagnose an issue... (right) showing that my cellular data us rated up to 75Mbps. Wow. 

The 1020's camera only reports output resolution, of course, not the underlying 41MP sensor.... (right) the possible camera stats are interesting to browse, though 'ms' is used wrong. Micro-seconds should use the Greek symbol 'μ'! 

CPU and machine stats are limited by what's available in WP's APIs. For example, there's no 'Free RAM' figure. Yet!

There are some spelling errors too, e.g. 'Primery' above, but no doubt these will get tweaked. 

You can try or buy PhoNetInfo here in the Store. Worth keeping around in order to keep track of updates or to sort out a problem in the future?