I would definitely check with the hotel or business and see if they have a what's app account... many do!
I used my JA phone to call a hotel a few months ago. I don't know how much it cost... I did a $10-ish dollar top up before my call. At home, my digicel roams on t-mobile.
Maybe check with your mobile provider and see if there is daily international plan that might be worth the effort.
Being naive, how much does it cost to call Jamaica from US? Is it worth searching out a deal or calling plan for a few phone calls a year? Thanks!
Best!