About eSIM (Embedded SIM)

eSIM stands for "embedded SIM" - a software-defined SIM that is built into the device's hardware at manufacturing time and provisioned by downloading an operator profile over the air. Unlike a physical SIM card, an eSIM cannot be removed; it lives in a dedicated chip on the device's motherboard.

Activation is done by scanning a QR code the operator provides. The phone reads the QR, contacts the operator's provisioning server, and downloads the operator profile. Activation typically takes 1-5 minutes once you have the QR - though identity verification (VideoIdent in Germany) may add 10-20 minutes upfront.

The consumer-eSIM standard is defined by the GSMA in SGP.22, and is supported by all major operating systems and almost every device launched since 2019. iPhone XS / XR (2018) and newer support eSIM; iPhone 14 and newer sold in the US are eSIM-only (no physical SIM tray). Pixel 3 (2018) and Galaxy S20 (2020) and newer support eSIM as well.

Most phones can store 5+ eSIM profiles, with one or two active at a time. This makes eSIM the natural fit for dual-SIM travel: keep your home number active while adding a local SIM in the destination country. The travel-eSIM market (Airalo, Holafly, Saily, Nomad, Ubigi) is built around this use case.

For domestic German use, eSIM is verified on Vodafone CallYa, O2 Prepaid, 1&1, fraenk, LIDL Connect, Lebara, AY YILDIZ, N26 SIM, and other brands. Activation friction varies - Vodafone CallYa and 1&1 have dedicated eSIM order flows; ja! mobil and Penny Mobil require a one-time SMS code from an already-active SIM.