Sim800l connection issue

[xfpd]

Your SIM is not valid... and your power supply is not supplying 2.4A of current.

SIM800L (World's Smallest) demo

This project requires just a few components: (Arduino) Uno Mk3, 'worlds smallest' SIM800L module (fitted with a male header and plugged into a breadboard), 3 x LM2596 2A step down power converters, a suitable level shifter and a 12 volt power supply. I have also used a decent aerial for the SIM800L module rather than the piece of bent wire supplied. I am in the UK and I am using an Asda Mobile prepay SIM card (EE network). Adjust one power converter to output 4 volts. This is for the SIM800L mo…