How to weed out spammers - Zillow Rental Manager

[Vasudev Kirs]

I published a listing on zillow rental manager and I got a text inquiry within a minute which seemed odd to me. Text message had bad grammar and white spaces - typical red flags of a spam. 

1. Is it possible to hide phone number from the listing? If yes, is it wise to hide it?
2. I am a property owner and dont want to be woken up by phone calls. Does Zillow require a phone number?