I like the idea of a phone that fully inserts into a laptop bay to get its functionality in a different form factor. Not sure the laptop needs a powerful CPU, if any. Or it could have a really powerful one while adding storage and memory.

I personally would want to also be able to switch off the telco signal.

Perhaps the bay would be in the laptop screen itself and the two screens could operate side-by-side - or in the main body and the phone would go dormant.