Dual SIM Function for GSM Modules, to allow for an MCU to Switch Between 2 SIM cards
1. Both Switches must be toggled when testing, simulates the MCU Port HI / LOW switching
2. The 3.3VDC simulates the MCU Port Voltage
3. Requires 2 x MCU Ports
4. Only 1 SIM Card must be active at a time, GSM Module will not switch on otherwise.
5. Use SN7002N MOSFET's based on low Vgs properties
