Trifa does not offer an unlimited‑data eSIM plan for Guam. All available plans have a fixed data cap, the largest of which is 100 GB with validity ranging from 3 days to 15 days, and prices from about $23 USD for 3 days to roughly $93 USD for 15 days.
For travelers who do not need extremely high‑volume data, these capped plans typically provide better cost‑performance than a hypothetical unlimited offering, and they support tethering. The 100 GB / 5d and 100 GB / 10d options are popular choices that balance capacity and duration for most short‑term visits.