Nope there is no secret code to test the display. You can use an app to test the screen however. Want to test the battery health of your iPhone or iPad? However, I also tried coconutBattery on an iPhone 5s and an iPhone 6s which were. Online testing for websites & apps with real devices including iPhone XS, including iPhone X, iPhone 8, iPhone 7, iPhone 7 Plus, iPhone 6, iPhone 5s, etc. iOS includes several useful tools for displaying how much battery life your iPhone has left, as well as which apps are consuming the most of.
You'll be able to test iPhone 5s' Touch ID feature with a Demo app at Apple Retail Stores. Posted by Gautam Prabhu on Sep 16, in iPhone 5s, iPhone. On the back of the iPhone you'll see the IMEI number. Compare it with the one in the OS. Go to Settings > General > About, and swipe down to IMEI, and compare them yourself. When you drop your iPhone in the toilet or leave it on the hood of your car as you back out of the driveway, you need to replace it quickly. Curious how well the battery inside your iPhone is doing? Here's how to check it.
If you are using an iPhone 5s or earlier, your phone is definitely not affected but to avoid unnecessary battery replacement, try this quick test. In all likelihood the screen won't be original. You'll be able to tell from a number of factors but none of them are conclusive as fake screens can. iPhone 4 & 4S (located in the charging port): iPhone 4S Liquid Contact Indicator. iPhone 5, 5C, 5S, & SE (located in the SIM tray slot): Liquid Contact Indicator. How to Check iPhone Battery Health. You can check your iPhone battery cycle count the same way you check a MacBook Hi – I have an iPhone 5S running iOS as well, and it does have Battery Health (Beta) rgds.