Is international roaming free in Eswatini when utilizing my existing US, UK, or EU SIM card, or will charges apply?

No, international roaming in Eswatini is definitively not free with standard US, UK, or EU SIM cards. Eswatini is not part of any domestic roaming agreements with these regions. Major home carriers such as AT&T, Verizon, T-Mobile in the US, or Vodafone and O2 in the UK, will apply their highest 'Rest of World' international roaming rates. These typically manifest as expensive daily passes (e.g., $10-$15 per day) or exorbitant per-MB charges, making DataESIM a far more cost-effective and predictable solution for high-volume data consumption.