Using a WDC W65C02S, I plan to create a touchscreen cellphone, with complete calling and texting support; support for user applications; a serial monitor over the charging port (USB-C); and two (emulated) AY-3-8910s for notifications and ringtones, as well as application sound.
I hope to have the phone be somewhat easily assembled, with a small number of parts.
Sounds very interesting, hoping for more details soon.