Not exactly. There are several Arduino based phones like the DIY Cellphone by David Mellis. I have an improved version of that right here.
"Open Source / Open Hardware"
All open phone projects have the exact same problem. The core component, the baseband (which is basically the phone) is a complete blackbox. AFAIK that's also true for the SIM800 used here. So arguing security is a bit dishonest.
"Price"
I'd say the price calculation is extremely optimistic. You'll only get that price if you buy the parts in bulk. Especially the PCBs.
"...yet there isn't a project like that"
Not exactly. There are several Arduino based phones like the DIY Cellphone by David Mellis. I have an improved version of that right here.
"Open Source / Open Hardware"
All open phone projects have the exact same problem. The core component, the baseband (which is basically the phone) is a complete blackbox. AFAIK that's also true for the SIM800 used here. So arguing security is a bit dishonest.
"Price"
I'd say the price calculation is extremely optimistic. You'll only get that price if you buy the parts in bulk. Especially the PCBs.
Anyways.. cool project!