I would like to build my own cellphone (phone calls and texts at least).
Having experience with Arduino, I found several cellular shields and libraries that could allow me to do so with Arduino.
However, this would make my phone pretty big (for a phone) as it would be the size of the arduino plus the shield.
Is there any smaller alternative for this?
I know a lot of development boards exist, and some of them are smaller (even Arduino mini for example), the only problem is I can't find one that has (or can have via a module) cellular capabilities in small size.
(and unfortunately I need to find something not too expensive of course)