My phone is connected to the carrier network, and I can use my call, SMS and data allowances, however when I go to Sim manager, both sim slots appear empty. Last week the details of my sim were in the correct position and I had a toggle switch to make the sim active/inactive.

Nor sure why the info has disappeared - I was wanting access to this so I could install and use an e-sim during a forthcoming trip.

Any ideas?