Unlike traditional physical SIM cards, an eSIM does not need to be removed or replaced to switch mobile carriers or plans. dsimfly esim for travel It allows users to download and activate a mobile network plan directly onto the device using a QR code or an app provided by the carrier. This makes it especially convenient for frequent travelers, dual-SIM users, or people who want to switch carriers without waiting for a new physical SIM. eSIMs also save space inside devices, enabling sleeker designs or larger batteries.