I’m learning about carriers like T-Mobile, de-prioritizing SMS and more activity from modules like the SIM7670NA, SIM7670G, SIM7600NA, etc. in North America. (Even though the modules are listed on TMO’s certified module list) This seems to explain why SMS sent to the modules are not arriving instantly(as fast as they would to a mobile phone). So 5, 10, 15 or more minute delays are common(testing for over a year), but many message are delivered instantly. So making a car alarm, with a possibly a 13-15 minute delay, using an above module may not be wise, or a time-sensitive alert for an agricultural system
So I thought, what if a cheap dumb-phone’s UART TX/RX lines could be accessed, and connected to an IOT controller project, there would be a full color display and more, plus instant SMS action 97% of the time.
I have not done this since using an old Motorola C168i 2G phone, as I found here.
Has anyone else done this with a newer 4GLTE device? (Not using an MIT App Inventor app with an Android)