To try and troubleshoot your mobile device’s speaker, here are several steps to consider:

1. Check settings: Make sure the speaker is not muted or on low volume.
2. Unplug and replug headphones: If headphones are connected, disconnect and reconnect them to reset the connection.
3. Restart the device by holding down the power button for a few seconds.
4. Check the phone connection: Make sure the device is properly connected to your phone.
5. Update software: Make sure the software is up to date to ensure it is compatible.
6. Check the audio jack: Make sure the audio jack for the speaker is clean and not full of dust, lint or dirt.