Should you use call-only ads?

Yes, if the business is closed by phone and someone picks up during the ad’s hours. No, if the booking is a link, a form or WhatsApp, because a call-only ad leaves no other path. Try calling in the hour the ad would be on. If it goes to voicemail, that format stays off. A clinic runs call-only and during appointments nobody can pick up. The patient hangs up and leaves no trace for a callback. A call ad only in the stretch when reception answers, and another path — link or WhatsApp — outside that stretch. The two do not overlap.