I have a question about ussd code in sim800l and arduino project:
How to send the amount of balance that is shown by running the code at + cusd in the monitor serial with SMS to my phone?
In fact, how to check the balance of the sim800l SIM card with a mobile phone?
question from:https://stackoverflow.com/questions/65843479/how-to-check-the-balance-of-sim800l-by-phone