What is MultiSIM?
A carrier feature that puts the same phone number on several SIMs/eSIMs or devices at once.
MultiSIM is not the same as dual-SIM: dual-SIM means two different lines in one device, while MultiSIM means one line mirrored across multiple devices at once, such as a phone plus a smartwatch. It's an add-on offered by a home carrier and is unrelated to the travel eSIMs sold on this site.