Test phone sound online with left and right audio-channel beeps. Listen and record what you hear.
Disconnect Bluetooth audio and headphones. Set a comfortable volume, play each set of beeps, then enter how many you heard. Listen for distortion too.
Left and right audio channels do not identify separate physical speakers. Routing depends on the phone, and listening remains a user confirmation.
No microphone permission is required.
Results are saved only in this browser for up to 24 hours. This single test does not replace a complete used-phone inspection.
Run the full buyer check