Apps such as Phone Diagnostics allow for thorough testing of components like touch screens, cameras, and speakers, as noted in this PCMag article.
Offers details about the device's system specifications. Other Ways to Test/Check Your iPhone Test & Check for iPhone
Dial *#06# to immediately show your device’s unique IMEI number, as shown in this PCMag article. Apps such as Phone Diagnostics allow for thorough
Provides information on CPU usage, battery health, and storage. holding both volume buttons
You can initiate a hardware test by turning off your phone, holding both volume buttons, and plugging it into a charger, according to this YouTube video .