How attachment of a multi-sim devices occurs in either 4G or 5G?

Devices
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1

Hello Everyone.

Anyone has an idea how attachment of a multi-sim devices occures in either 4G or 5G?

Multi-sim: a technology,just reading about it in Orange France, where you can use the same number (MSISDN) on the same mobile / tablet / car… at the same time.

I think here the HSS is mainly involved for mapping the same MSISDN to different IMSIs.

What I think is that the network attachment will be normal as any 2 different devices.

Any other ideas about that?

2

Another example of such use case is your smart watches like Apple Watch with cellular function.

It has e-SIM attached / mapped to same msisdn paired with iPhone.

If you have any testing traces do share.