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How much more complicated and annoying is the process if you're going iPhone to Android or Android to iPhone?

You take the SIM card out before handing it someone else.

you scan the QR code with your android phone. That will cause your existing phone to be unregistered.

What eSIM does is turn the physical smart card into a QR code which can be shown on a screen in addition to being printed on a piece of physical paper.

In my experience, you need the old phone to scan something in order to unregister the eSIM. Might be that it depends on the carrier, not sure.

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