Glossary

Travel eSIM terms

Short definitions so checkout and install feel less mysterious.

APN

Access Point Name — network settings a phone uses to reach the mobile internet. Most modern eSIMs configure this automatically.

Dual SIM

Using two lines at once — typically a physical SIM plus an eSIM. Common setup: home number for calls/SMS, Roamio for data.

eSIM

A digital SIM profile installed on a compatible phone — no physical card. Used for travel data plans like Roamio.

Hotspot / tethering

Sharing your phone’s mobile data with a laptop or another device. Not all eSIM plans allow it — check the plan details.

IMEI

A unique device identity number. Sometimes used by carriers for unlock status — not usually needed to install a Roamio eSIM.

Roaming

Using your home carrier network abroad — often billed per day or per MB unless your plan includes fair-use roaming.