Please troubleshoot using the following methods.
- Check that your device isn't set to silent
- Check that your volume isn't turned down
- Check that the sound isn't outputting to another device, such as earphones or headphones
*If the word "headphones" is displayed or a headphone icon appears when adjusting the volume, there is a possibility that earphones or headphones are connected. Please disconnect the earphones/headphones and see if this resolves the issue.
The specific steps to check each of these things vary depending on the device, so please contact your device's support service or mobile carrier if you have any questions regarding your device in particular.