> Two seconds of thought suffice to show how that doesn't work: if a digital computer can do everything the brain can do, because the brain is a biological computer, then how come the brain can't do everything a digital computer can do? Is it possible that two machines can be both computers, and still not equivalent in every sense of the term? Nooooo!!! Biological computers!! AGI!!

Another two seconds of thought would suffice to answer that: because you can freely change neither hardware or software of the brain, like you can with computers.

Obviously, Angry Birds on the phone can't do everything digital computers can do, but that doesn't mean a smartphone isn't a digital computer.