To get to field test mode, you dial *3001#12345#* and press the call button. In iOS 15 you get a lot of information and it’s presented very cleanly compared to how it was presented in previous versions of the iOS software. The only problem is, it doesn’t tell you anything good. This is a screen capture of the new field test mode.
Open the Phone app, tap the Keypad, and then type *#0*##0*#. A diagnostic screen pops up with buttons for a variety of tests. Tap Red, Green, or Blue to test those pixel colors. Tap Receiver to
10. Unblock calls. To unblock incoming and outgoing phone calls on your iPhone, you will need to type in the code #33* {pin code from your SIM card}# on your dialer. 11. Enable call forwarding. To enable the call forwarding feature when someone calls you, you need to type in the code *21# on your dialer.
First, swipe down from the right-hand side of the iPhone screen to view the Control Center and turn off the Wi-Fi. Then, launch the Phone app and dial 3001#12345#.
Price: $1.99 Download from AppStore: Test & Check for iPhone Related: 11 Hardware Checklist Should Perform Before Buying Used iPhone Sensor Kinetics. This is another one of the smart applications that can be used for an iPhone to check the functionality of all of its sensors.

Step 1: Tap on the Phone app icon to open it. Step 2: Dial the code you want to use. Look for the Samsung touchscreen test code in the list provided in Part 1 if you have a problem with the touchscreen. Which secret code to use will depend on your issues. Step 3: Press the call button.

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    • iphone 11 screen test code