Are there specific questions I should be asking or certain search terms I should be using so I don't keep getting spammed with 50 calls a day about a cash out refi I never asked for? 

In my experience about 98% of the leads you get are garbage and spam; however, it is a free option.8.

@Gary DezoysaLook at it another way - how many spam phone calls do you answer?

@Tyler D.I've never seen a more sure-fire way to get spammed by a lot of real estate agents.

See the evidence and research.People pick up phone calls more than opening spam mail send to their inbox.

I also believe this is not spam because the buyers took initiative to inquire. 

These always catch me momentarily and make me wonder if this is a neighbor telling me the house exploded or collapsed in a sinkhole, but I know if I respond it will be spam to buy the house.These seem new. 

For all the postcards, letters, "ringless voicemail", SMS spam and virtual assistants I get calling me, I think I've had ONE real honest person call asking if I was selling, and even though I wasn't,  I talked to him like a normal person and gave some advice about cold calling.

On the other hand if you're 99% confident in your tenant's ability to not overreact to minor issues and that they won't spam you, then by all means give them your personal number!

They spam it like it crazy.