It will work if you had enabled Wifi calling feature while you are in US connected to Visible network and then in Cayman Islands connected to Wifi. But the caveat is you cannot call local cayman islands number. But you can call and talk to any US number.
If you want to call a local cayman islands number you may have to buy a local SIM at the airport for tourists.
Just another visible user, willing to help others.
Please mark my answer as solution if it helped you.
