It's all wireless with all separate parts including the dialer you can hide many places that uses a SIM card from any cell provider.  

I did mention to her that to start out she could be very specific and help those who work in the wireless industry because typically they make good incomes and most rent.

With the price of wireless cameras being so much cheaper these days I would leave that up to the tenant.

If you want to go an extremely cheap and zero work involved method, Amazon sells those wireless doorbells.

It is wireless and has a cellular uplink to a monitoring service.I ordered a refurbished model which has been problematic initially.  

That's the way it should be.They wouldn't let unpaid bills run out of control like that, into the thousands$$$$.util companies should run like wireless phone service providers- got good credit?

One option is to write into the lease the tenant is required to have wireless internet connection. 

Get a Zagg wireless keyboard attachment...it will make you much more productive...you can type on a regular sized keyboard, which is much faster than the on-screen keyboard (in my opinion)...

If it’s not something you normally provide to tenants, with the newer wireless systems it’s easy to move from one property to another when you have a vacancy.

There are meters that send a signal using cell phone towers (note that now you will need either battery or power at the meter) and others that use other wireless spectrum for reading.