At least now I know not to really expect service in Bahamas. I also thought that Domino's Pizza SMS was funny. I was really impressed with CBW too. Every single call completed sucessfully, and it was very clear.
BTW, I believe I was roaming on a network(AT&T) in Anguilla, when I received that call that I did not get charged for. Riiing has free incoming calls in Anguilla. GSM world also lists Cingular as one of the carries there.
http://www.gsmworld.com/roaming/gsminfo/cou_ai.shtml
Phones: Xiaomi Mi Mix 2, Samsung Galaxy A50, ASUS zenfone 3,
Sim cards: AT&T (Contract), 3 UK, Piranha Mobile