When I call my home phone, Comcast Landline, I get several different type of error messages. The one most often heard is "You cannot call that number from
this line. You can only call 911". I have the same problem when I try to call my daughter's home phone, also Comcast landline and she cannot call us on
her cell (Verizon) or she will also get the error message. This does not happen all the time, just occasionally. I use a 5s, my wife a 4s and my granddaughter
uses a 6. We all have the same problem.