While on a phone call I cannot hear the other party's voice or they cannot hear mine. (WF-SP900)

1. Select your issue details:

   I cannot hear the other party's voice

   
   Go to step 2.

   The other party cannot hear my voice

   
   Go to step 4.

2. Check the following on the connected device:

   1. Make sure that the headphones are connected via Bluetooth.
      Note:  If a Bluetooth connection is not established, refer to the appropriate article:
      • For Android: Connecting the player to an unpaired Android smartphone for the first time
      • For iPhones: Connecting the player to an unpaired iPhone for the first time
      • For NFC: One-touch connection (NFC) with an Android smartphone
      • For other devices: How to pair Bluetooth headphones with a Bluetooth source device
   2. Check the Speaker settings on the connected device:
      • For Android: While you are talking, tap the Speaker or Bluetooth icon, and then select WF-SP900 Hands-Free.
      • For iPhones: While you are talking, tap the Audio icon, and then select WF-SP900 Hands-Free.
      • For Computers: While you are talking, right-click the Speaker icon at the right side of the computer screen, open the Sound settings, and then select Headset (WF-SP900 Hands-Free) from the pull-down list of the Speaker setting.
      Note: The settings menu items may vary depending on the connected device.
   3. Turn up the volume on the connected device.
      Note:  Make sure that the speaker is not muted on the connected device.
   4. Restart the connected device.
      Note:  If the connected device is temporarily unstable, the restart may resolve the issue.

   The issue is resolved

   The issue may have caused by the Bluetooth device settings or a temporary malfunction.

   The issue is not resolved

   • If the connected device is Android 10 or later, or a Windows computer, go to step 3.
   • For all other devices, go to step 5.

3. If the connected device is Android 10 or later, or Windows computer, check the following setting:

   For Android 10 or later:
   1. Open the Settings menu on your smartphone.
   2. Select Connected devices.
   3. To the right of the headphones model name, tap the Settings icon.
   4. Set the Call setting to ON.
   For Windows computer:
   1. On the right side of the computer screen, right-click the Speaker icon.
   2. Open the Sound settings, and then select Sound Control Panel.
   3. Select Playback tab to show device list.
   4. Select the connected headphones, and click Set Default.
   Note: The settings menu items may vary depending on the connected device.

   The issue is resolved

   The issue may have caused by the Bluetooth device settings.

   The issue is not resolved

   Go to step 5.

4. Check the following on the headphones or connected device:

   1. Set the headphones in the charging case, close the lid, wait for a few seconds, and then remove the headphones again. This will restart the headphones.
   2. Restart the connected device.
      Note:  If the connected device is temporarily unstable, the restart may resolve the issue.
   3. Try speaking louder as the ambient sound may prevent your voice from being heard.

   The issue is resolved

   The issue may have been caused by a temporary malfunction of the headphones or connected device, or ambient sound.

   The issue is not resolved

   Go to step 5.

5. Restart the headphones.
   Refer to the Restarting the player article to reset the headphones.

   The issue is resolved

   The issue may have been caused by a temporary malfunction of the headphones.

   The issue is not resolved

   Go to step 6.

6. Initialize the headphones.
   Note: All the data (music files, pre-installed data, etc.) saved to the main memory of the player will be erased. Before initializing, backup any important data.

   Refer to the Resetting and reformatting the player article to initialize the headphones.

   The issue is resolved

   The issue may have been caused by a temporary malfunction of the headphones.

   The issue is not resolved

   Go to step 7.

7. If you have a different smartphone, Walkman, or other device, try to perform a Bluetooth pairing with the headphones and one of these other devices:

   The issue is resolved

   The connected device or application may be the cause. Use a different device or application, or consult a manufacturer of the device or application.

   The issue is not resolved

   Turn off other wireless devices or move away from those devices because wireless interference can cause the issue. If the issue is still not resolved, the headphones may be malfunctioning, and service may be required.

Go to the Headphones Troubleshooting Guide