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If you suspect something isn't working right with your HTC M8/M9 Phone, there is a built in Service menu that can help you test the fault yourself.
This could help you get a quicker repair or even help you solve the problem yourself...
Open the Phone App and paste the following Service code:
Tap on the Accept button to agree and proceed to the Service menu.
You will then have access to 2 screens of diagnostic tests.
All the tests are safe with full on screen instructions given.
Hope this helps you solve any issues you are having?
Thanks 63johnw, if you have need to use any of the tests in the future it would be great if you could share your experience.
If anyone else uses this service menu, please share your experience here; it might help someone else... 😉