Here are some things you can do to fix a slow or unresponsive internet connection on your mobile device:

1. Ensure that your device is connected to a reliable Wi-Fi network or strong cellular signal.
2. Restart your device, and reset the Wi-Fi by turning it off for a few minutes.
3. Restart the router or modem, and make sure it is properly connected.
4. Check your internet service provider for any outages.
5. Disable unnecessary apps and features to limit interference.
6. Delete temporary files and junk data accumulated on your device.
7. Change the location of your cell phone or device away from walls.