Everything short of the vocal pause stuff an old Sansa will do for you, running a tiny embedded C based runtime.
> These things have become so everyday that we hardly notice most of them, but without serious on-device processing power, some of which would have been beyond $10k workstations just 15 years ago, none of this would be possible.
The modern photo and video stuff is super cool and uses a ton of processing power. Likewise for high quality video streaming, decompressing is hard work, though often offloaded to HW these days.
Everything else my desktop of 15 years ago handled just fine, with 256MB of RAM.
Heck my smartphone in 2006 with 64MB of RAM did most of this stuff.
The one thing that has remained constant across a decade of smart phone development is the Pandora app getting forced closed all the time.