What Is an eSIM? Benefits, Limits, and Migration Tips

An eSIM is a carrier profile downloaded to secure hardware in a device, enabling cellular service without inserting a physical SIM card.

How eSIM works

A carrier provides a QR code, app, or direct-transfer flow. A device may store several profiles, although the number of simultaneously active lines depends on hardware and carrier support.

Benefits and limits

eSIM is convenient for dual numbers and travel data. Support still varies by device, country, and carrier, and migration may require connectivity, identity checks, or support assistance.

Before changing phones

Confirm compatibility, retain a backup verification method, and do not erase the old profile until the new phone has service. Reset the old phone only after calls, messages, and data work.

Reference

• support.apple.com