If could only use TWO of the following tech devices and no other (phone/computer/tablet) which would you choose?

If I knew how to make a poll that would be great, but for now this will do.

Options A/B/C

A Phone/tablet

B Phone/computer

C tablet/computer

computer could be either a desktop or laptop, a computer is a computer.

Trying to get a feel for what you all think are the essential tech devices.