Thank you for the email and we apologize for this inconvenience. Please see below for Square's troubleshooting tips: 

  • Make sure you’re using a supported device.
  • Check that the Square app has access to your device’s microphone. This access allows your device to detect the reader.
  • Remove your device’s case, firmly plug in the reader and swipe again. Some phone cases prevent the reader from plugging in all the way.
  • Update the Trail's End app.
  • Delete and reinstall the app on your device.
  • Temporarily disable Bluetooth from your device settings.
  • Check for lint or dust in your headset jack or Lightning connector. If you find debris, pull it out or blow carefully into the jack.
  • Wipe the metal connector with a cloth. Residue can collect and prevent the reader from making a proper connection.
  • Check for corrosion inside your headset jack or Lightning connector. If you see a green color, that’s evidence of corrosion, and you may need to take your device in for service.
  • Clear debris from the card reader slot with a card reader cleaning card or a paper towel.


The issue may also be related to the adapter you are using (if applicable). Please use the following troubleshooting tips:

  • Restart the phone
  • Turn off and then turn back on all permissions for the app
  • Be sure you are using the most up to date version of the app