If your Uniden phone says “check Tel line,” it means that there is a problem with the phone’s connection to the Telco. There are a few things you can do to try and fix the problem:

  1. Check that your phone is plugged into an outlet and that the power is on.
  2. Try restarting your phone.
  3. Try calling your Telco from another phone and see if you can get through. ..