I mean after all, if you don't pay your cell phone bill on time, you get cut off or pay a fee, right?  

All my tenants have my personal cell.

Because I cannot single them out I had to do it everywhere so this costs me over $2,000.00 for equipment and installation.I talked with them again and I told them what my cameras have captured and gave them a 60 days notice to leave (breaking 12 months lease).I did talk to the local police department and I was told that unless I see them exchanging drugs for money there is nothing they can do and suggested I call them next time I see something happening so they can catch them in the act.The day I served them with the 60 days notice they told me that I cannot prevent them from doing their innocent internet business of selling cell phone batteries especially if it does not bother anyone.

Liability can then be limited to each "cell" and the owner of any cell is insulated from activities of other cells, state dependent.

And I would question this from the stand-point of wanting to make sure that all is well with the unit and its appliances / devices, etc...

Spray foam (open-celled) is your best option for the walls, if you don't have any.  

I use many applications on these devices, making sure that I'm able to use all of my apps on all three devices.

BUT...I wonder if being "dirt poor" means they don't have...cable, the internet, cell phones, pets, smoke, drink, have multiple cars, window AC units...hmmm, make's ya wonder! 

I tried to add a link to his name but it appears I can't on a cell phone.  

But I can't confirm the number is hers (it's just what was given to me by previous owners, could be a typo), nor do I know if it's a cell number or landline.