Answering be saying "Hello" tells the telemarketer/spammer that they have reached a private/personal number. I answer any unknown caller with "Joe's Bar & Grill". The caller usually hangs up immediately.
Sometimes I answer with "Mel's Mortuary, you stab 'em, we slab 'em".
In all seriousness, the Hiya app works well for me. My phone never even rings for most of the spammers.
Bill & Linda, 2019 Ram Laramie 3500 dually 4x4 diesel, Hensley BD5 hitch, 2022 Grand Design Solitude 378MBS, 1600 watts solar, Victron 150/100 MPPT controller, GoPower 3kw inverter/charger, 5 SOK 206AH LFP batteries for 1030 ah