GSMA consumer eSIM (SGP.22) v3.x adds optional support for Multiple Enabled Profiles (MEP), where a single eUICC can have multiple concurrently enabled profiles.
This is required so that multi-SIM UEs do not need multiple physical eUICCs.
Android supports this since Android 13, see https://source.android.com/docs/core/connect/esim-mep - hence I’m wonering if anyone knows any commercially available UEs supporting that feature?
On a technical level it’s quite interesting how this is implemented: When I first read SGP.22 v3.x many months ago, I though that such an eUICC would have multiple physical ISO7816 UARTs (one to each baseband). However, it’s actually logically multiplexed on one UART by a new feature defined in ETSI TS 102 221 17.4.0 called LSE (Logical Secure Element) and LSI (Logical Secure element Interface). It’s a bit like ISO7816 logical channels but at a lower layer; instead of MANAGE CHANNEL there’s a new MANAGE LSI command, etc.