https://makezine.com/projects/build-1930s-style-dieselpunk-cellphone/
https://hackaday.io/project/5083-diy-smartphone
April 24, 2018
https://makezine.com/projects/build-1930s-style-dieselpunk-cellphone/
https://hackaday.io/project/5083-diy-smartphone
Administrator
at+sttone is ringtone ( i think )
yep. this is it....
at+calm=1 --> gets the call tone when dialing to be ...
or maybe it its this at+crsl=? at+crsl? at+crsl=10
https://blog.jokielowie.com/en/2016/10/raspberry-pi-oraz-siec-gsm-wysylamy-sms-laczymy-sie-z-internetem-iot/ GSM DC power converter