Launch the phone app and open the keypad. Tap the following keys: #0#. A diagnostic screen pops up with buttons for a variety of tests. Tapping the buttons for Red, Green, or Blue paints the screen in that color to make sure the pixels are working properly.
What is the best iPhone diagnostic app?
TestM is a FREE full hardware diagnostic app available for your smartphone and mobile device. Use TestM to check your phone info & specs, get a full report to repair just what you need to and no more. Create accurate online certificates to buy or sell your phone. Compatible with more than 14,000 iOS devices!
How do I run a performance check on my iPhone?
To check battery on iPhone, open Settings and tap Battery. Tap Battery Health to check the health and the performance management feature that prevents unexpected shutdowns by dynamically managing your iPhone's performance. It can also automatically turn your device off.Dec 6, 2019