Dual SIM (Switching GPO) - NO CORRECT WORK


I use dual SIM, and switch between them using the GPO pin.
But , works this variant not correct…
When enabling is initialized first SIM,and under switching GPO pin
second SIM is not initialized.

Thank you in advance.

Depends on what you are switching. Supply voltage?
Write down what exactly your proceeding is.

IMO the module doesn’t catch the change.


On not use SIM(rezerv) I fix RESET(use SIMRST ) -active, and on SIM(Base) I permit exchange data…