Lack of competition please clarify as T-mobile seems to be their primary carrier, along with many smaller companies. I had to purchase an AT&T sim while there to use my phone. There was no mention or notice of a Verizon network anywhere on the island. I was not able to pick up a signal unless I was connected to a strong wifi signal or someone's Hotspot.
As of July 2023, no service with their basic service, except for WiFi when available. I think Visible+ uses roaming, but I didn't have that option. I ended up buying a phone to use while I was there. Really disappointed with Visible on that front because I'm happy with the service in the United States.