Updated: Sep 14, 2019
So what is this new open source device? It's a VoIP phone that's designed to be reused and re-purposed. It has an ESP32 processor and it's programmable in Arduino. It's basically a nice dev board that's portable and can be used permanently instead of looking like a mess when you're done with a project.
This is the project site: http://wiphone.io
If you sign up to the mailing list before crowdfunding starts you get a battery upgrade and your phone will delivered first. Crowdfunding starts in a few days and they are hoping to have a big launch, so check them out and we will keep you informed when the project gets closer to launch!