"Test & Check for iPhone" is a utility tool designed for diagnostics and hardware monitoring on Apple devices. It is often bundled with or categorized under "My Device Info" apps on the App Store .
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 . Test & Check for iPhone
Dial *#06# to immediately show your device’s unique IMEI number, as shown in this PCMag article. "Test & Check for iPhone" is a utility
Offers details about the device's system specifications. Other Ways to Test/Check Your iPhone Test & Check for iPhone
Provides information on CPU usage, battery health, and storage.