eSIM

An eSIM (embedded SIM) is a digital SIM built into your phone that lets you activate a mobile plan without inserting a physical SIM card.

An eSIM (embedded SIM) is a programmable chip soldered inside your phone, watch, or tablet that does the same job as a plastic SIM card: it identifies you to a mobile network. Instead of swapping a physical card, you download a "profile" from a carrier or travel eSIM provider — usually by scanning a QR code or tapping an activation link.

For travelers this matters because you can buy a data plan for your destination before you fly, install it over Wi-Fi at home, and come online the moment you land — while your home SIM stays in the phone for calls and texts.

Most phones released since 2018 support eSIM, including iPhone XR/XS and newer, Google Pixel 3 and newer, and recent Samsung Galaxy flagships. The phone must also be carrier-unlocked to use a third-party eSIM.