YUP  to support our charity I rent my time out for phone consultations. 

Not sure your guest access, but I have keypad entry, I use the last 4 digits of the phone number used when booking.

It would probably be worth a phone call to the Garland Planning and Zoning department to ascertain which areas are permitted to have short term rentals. 

The realtor never shows the property or signs anything—just a couple of phone calls.  

Try their phone number ... you will all be OK

Can anyone recommend a third party phone/answering service that can field and respond to maintenance requests from tenants?

If you still promote them on your platform my opinion is that you need to encourage them to work on their communication skills towards the customer...Hey @Anthony Stephenson, sorry I wasn't able to get you on the phone that week.

Ricardo, If you don´t mind I´ll PM you with my phone number so you could add me as well.

Despite android having more phones,  I'd guess iTunes is 95% to 5% in terms of podcast downloads from Android vs. iTunes. iTunes just cleans up when it comes to Podcasts! 

From what I am understanding the tenants are ALL caught up but have been late and you are speculating on what your phone call will be, and speculating about evicting.