How does an eSIM work?

An eSIM works like a traditional SIM, but the carrier profile is downloaded over the internet. After you buy a ByeRoaming plan, you install the profile (QR or App quick install) while on Wi‑Fi. When you enable the travel line abroad, your phone attaches to a local partner network and uses prepaid data.

1. Purchase a country or regional plan in the ByeRoaming App.
2. Install the eSIM over Wi‑Fi before you rely on it.
3. On arrival, turn on the travel eSIM for cellular data (and Data Roaming on that line if prompted).
4. For most plans, validity starts on first local network connection — not at purchase.

See When does my eSIM validity start? and Japan eSIM for a destination example.