https://www.lifewire.com/how-to-fix-an-iphone-stuck-on-the-apple-logo-2000268
https://www.lifewire.com/how-to-reset-iphone-2000288
February 17, 2018
https://www.lifewire.com/how-to-fix-an-iphone-stuck-on-the-apple-logo-2000268
https://www.lifewire.com/how-to-reset-iphone-2000288
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