Thank you!
No, I didn't have WiFi enabled. However, I called myself from the callbox and pressed 9 a couple of times for a few seconds each and that seemed to work. Go figure! Thanks for your help!
It is a community gate. Visitors call me through a callbox that is connected to my cell#. When I answer I dial "9" and it opens the gate. The only thing I can think of is that it has something to do with the tone.