HTC One M9 User Manual page 88

88 Your first week with your new phone
Having hardware or connection problems?
Before calling for support, you can first use the Help app to troubleshoot or perform
diagnostics on your phone. This helps you in finding the problem cause, and in
determining whether you can resolve the problem or you need to call for support.
From the Home screen, tap
If HTC Help is not preinstalled on your phone, you can download it from
Google Play.
, and then find and tap Help > Tips & Help.