Phone Test
Check that everything works as it should – especially handy when you are buying a used phone. Nothing is recorded or sent: all checks run on your device only.
Good to know
For the microphone and camera the browser will ask for permission – it lasts only while the page is open. Some checks (vibration, battery, sensors) do not exist in every browser, especially on iPhone; the page then says the check is not available, which does not mean the phone is faulty. This is a quick check, not a professional diagnosis.