Tired to pay a third party system for SMS in my app, so am building my own "FROM SCRATCH"

Implement your own SMS exchange protocol to use on ATmega328P based Arduino boards and AiThinker A6 GSM module.

Arduino Uno/Mega Stove Controller: Transforming Used Oil into Warmth 🔥

Symbian Series 60 application showing the SMSC address of SMS messages in the inbox, along with a preview. Many phone UIs did not display that information.

A temperature sensore using DHT11 and SIM800L that replies back to you with SMS

IOT Temperature Alarm System using hologram.io cellular service

Android app that polls REST APIs to get a list of SMS to send (and notify back on delivery)