Its a hunting app called Onxhunt but it is a typical GPS map that overlays tax data to give you name and address of owners. 

My message is hand-written and genuine. 

I can leave a voicemail that sounds like a real voicemail and make it sound like a good message that I’m genuinely interested in talking about their home, and I tell the truth that I’m an agent and investor.  

First I would like to find properties to buy and hold and for now pass off any deals I find but don't want, maybe for a small finder's fee or refer to my agent if they want to much but seem to genuinely want to sell.

Sending out physical letters seem more genuine and have a much better chance of actually being opened.