Why do SIM cards keep getting smaller, but the phones are getting bigger?

THAT DOES NOT MAKE SENSE
https://www.youtube.com/watch?v=6Xywqv1cDH8

So now we have the micro SIM, the micro USB?
What's next? The nano SIM, the nano USB?

A SIM card so small you need an electron microscope to insert it?
A USB charging cable so small, you need Sherlock'

s Holmes magnifying glass just to plug it into your phone?

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Dan193 · 31-35, M

I think sim cards will disappear completely and phones will come with their own number. Or you'll just have some accout on some "universal sim card site" and that code number will be your phone number. Or maybe even use your e-mail as your phone number. There are ton of things they could do to make it easier.