As far as I know the SIM800/900 family can only be powered on and off with the PWRKEY pin.
@Jean-Philippe_Rey started
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
As far as I know the SIM800/900 family can only be powered on and off with the PWRKEY pin.