You know it's not the same. You don't hook up your phone to an external monitor and a full-sized keyboard and you don't run desktop software on it.
OTOH, a current phone could emulate an Amiga in real-time without much effort. I could, conceivably, run an Amiga desktop off any HDMI equipped phone with a Bluetooth keyboard and mouse.
I've been playing with an Insignia Infocast -- basically a trivially rootable, ARM-based Chumby computer that costs 100 bones at Best Buy.
I dunno, bochs is pretty fucking slow on my 3GS...