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I don't doubt that @sauravrungta.
A universal sim in fact which will support all the network and will choose automatically based on the best one available at the location. But, then they will have to figure out a way with the network companies to come up with a single solution to the network plan variants.

I think they have this thing called "esim" which they debuted on iPads first, if I'm not wrong. They could very easily go that route if they wanted in the future.

Yup! You're right Saurav! They introduced it for Apple Watches & iPads earlier.