Ahead of its time with no headphone jack
It's pretty interesting, I run a Pi3 as a mini homelab/personal cloud, they're great little PC's.
Lol, get yourself some Bluetooth headphones, curmudgeon!
Looks to me like a so-called feature phone, not sure where the smartphone aspect is coming from. There was a cool and humorous talk by a guy who also made his own phone from !!Con 2015:
I think the smartphone aspect comes from the little included screen that provides a visual interface for a Linux-based OS and many different Linux apps.