Start by unplugging the cell phone charging cable from the 5V out port. Then pick up the home phone and listen.

You hear that the phone is not connected

No dial tone only when the charging cable is plugged in

Press 60# on your home phone keypad. That handles a charging cable that interferes.

After a call ends, the home phone can take 30 seconds to a couple of minutes to get its dial tone back. To skip the wait, press the Flash button on the phone to get the dial tone right away.