Unsolicited text and calls inquiring about purchasing property

[Eric Ashby]

I am a small investor (10 rentals) and I receive multiple calls and texts daily (even at my workline) asking if I would be interested in selling property I own. Is there a way to stop this without changing the legal oner of the properties. On a side note I thought it was illegal to send unsolicited messages to a cell phone, is this not the case?