a google voice number that forwards to your cell is the way to go
or, you can get a toll free number. a decade ago, I used Accessline for that, through costco, under $10/m and it was great bc it would ring to the office landline during the day but to my cell in the evening, which was what I needed at the time, and I never had ot giv eout the actual cell number or local office number, just told everybody the toll free line, put that on the website and business cards, etc
the one thing you super never ever want to do is give out your personal number. especially not on you website. somewhere along the way somebody did learn my actual cell number, maybe a vendor or maybe from legal docs, I don't know, but the point is I still have the same personal cell and even though that business was closed, my number was obviously sold to some marketing list because I get cold calls from people trying to sell things to my old business needs, even now.