I am posting this from my phone, as I often do. This is a Nokia E63, an oldish model that is in no way comparable to a computer. But there is no reason why a newer Linux-based phone can't come with a laptop dock (like the Asus Padfone) and be a perfectly useful laptop. Or, indeed, paired to a keyboard/mouse and hdmi monitor and be used as a desktop. It is even possible with android without too much trouble if it's rooted and you're ok with a chroot setup and vnc display.