1. Make sure the printer is connected to the same Wi-Fi network your device is connected to.
2. Check the power source connected to the printer. Make sure the printer is turned on.
3. Ensure you are using the correct app and driver. Check the printer manufacturer's website for the correct app and driver compatible with the printer and your mobile device.
4. Check the printer settings to make sure they are set correctly. Be sure to check the paper size and type before attempting to print.
5. Troubleshoot the app or driver. Check for updates or reinstall the app if necessary.
6. Double check the cables connected to the printer and device. Make sure the printer and device are firmly connected to each other.