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I want a stretchable phone. Starts as a 15cm diagonal screen, can be stretched to 30cm tablet size.

I want a phone that can be connected to external monitor and used like a desktop computer.

I also want that, plus the reverse:

When you attach the tablet via USB4, it becomes a screen. It also shares its CPU, GPU, storage etc with the main PC.

Can't basically all Samsung phones do that? https://www.samsung.com/us/apps/dex/