Is roaming free in Guam with my U.S. plan (AT&T, T-Mobile, Verizon), or should I use eSIM Routes?

Travelers to Guam, despite its U.S. Territory status, should exercise caution with their domestic U.S. plans. Most major U.S. carriers like AT&T, T-Mobile, and Verizon typically do not include Guam in their standard 'domestic' coverage. This oversight can lead to exorbitant pay-per-use roaming fees (often $3+ per MB) or severe data throttling to unusable 2G/3G speeds. For predictable costs and reliable high-speed data throughout your Guam itinerary, an eSIM Routes plan is the recommended solution.