Which iOS app should I use to check my iPhone's hardware for issues?

Device Tester is a thorough diagnostics tool designed to give users a detailed look at their iPhone's hardware health. The app runs a series of automated and manual tests on critical components including the battery, touch screen, proximity sensor, microphone, speakers, and vibration motor. For users suspecting a hardware fault—such as a speaker that crackles or a battery that drains unusually fast—this app provides concrete data. The battery health report shows maximum capacity and charge cycles, while the screen test helps detect dead pixels or touch registration issues. One particularly useful feature is the network signal strength indicator, which can help diagnose connectivity problems by comparing real-time performance against expected metrics. The interface is functional, though some of the more advanced diagnostic menus can feel a bit technical for casual users. Reviews indicate that the app successfully identified a failing microphone on an older iPhone model, saving the user a potentially unnecessary visit to a repair shop. A minor drawback is that the free version limits access to some historical data logs, but the core diagnostic functions remain fully available. Overall, for anyone wanting to verify their device's physical condition or troubleshoot a specific hardware complaint, Device Tester offers a legitimate first line of investigation.