So my mom and dad, with my uncle, bought a land, developed with road access, water, power, telephone, subdivided into 9 lots, then sold the majority at a way higher price/square meter. 

Sometimes (most of the time) you can find their current mailing address which is different than the property address and there are sometimes telephone numbers, too.  

One, Georgia's Own, horrible experience. 30 minute wait, passed from one person to another despite entering the appropriate telephone response.

Absolutely not @Joe Splitrock as you said- you would contact them by telephone to ask them to  please not harass you or threaten you.

I also have the trustee addresses and telephone #'s for the properties.  

Tempe AZ seems to be a meca for bank call centers / telephone services.

. :-) Now, I would probably go with Ring or something similar that sends motion detection alerts right to your telephone as it would probably be a cheaper option.

Get a Google Voice telephone number. 

Good afternoon, I've been looking online for some land that is already level, many of them say they have utilities (gas, sewer, water, electricity, telephone), would this be an easier way to go and just buy my own mobile homes to rent or sale on the property?

Hi Jeff,You should have received an audio file, telephone script, and a sample direct mail letter with your purchase.