How To Run Diagnostic Tests on Your Smartphone

Modern smartphones are complicated little beasts. If you're having a problem, it can be hard to figure out whether it's caused by hardware or software. As this article points out, you may be able to access a couple of built-in diagnostic menus by dialing a short code.

The article gives two codes for Android smartphones. The first one worked on both mine and my wife's phones but the second didn't do anything. This is the diagnostic menu that the first code opens.

The article also information about iPhones and short-reviews of some third-party apps that you can use.