I have some questions that I am hoping some of the sifus here can answer for eSim:-

1. If I install eSim on my iPhone and insert an overseas sim card into the physical slot, do I have to select the primary and secondary profile?
2. If yes, are there limitations (e.g. primary can receive text and calls and secondary can't?)
3. What happens to the data usage? Where would the data usage be drawn from, the eSim or overseas sim?