Dial *3001#12345#* followed by the call button to reveal advanced network settings and cellular data information, as explained in this Wilson Amplifiers blog post .
Provides information on CPU usage, battery health, and storage. Test & Check for iPhone
Apps such as Phone Diagnostics allow for thorough testing of components like touch screens, cameras, and speakers, as noted in this PCMag article. Dial *3001#12345#* followed by the call button to
Offers details about the device's system specifications. Other Ways to Test/Check Your iPhone according to App Store descriptions.
Dial *#06# to immediately show your device’s unique IMEI number, as shown in this PCMag article.
Helps check sensors and parts, according to App Store descriptions.