Try to connect with a charged LIPO 3.7 or charger that provides 2A and voltage under 4.4
You have to connect the GND of arduino with GND of LIPO (common GROUND)
IF does not work, buy sim800L (red pcb), I never had problem as the above module
Try to connect with a charged LIPO 3.7 or charger that provides 2A and voltage under 4.4
You have to connect the GND of arduino with GND of LIPO (common GROUND)
IF does not work, buy sim800L (red pcb), I never had problem as the above module