# Dual SIM (Switching GPO) - NO CORRECT WORK

**URL:** <https://forum.sierrawireless.com/t/dual-sim-switching-gpo-no-correct-work/1137>\
**Category:** Open AT\
**Created:** [February 28, 2007, 8:34am UTC](https://forum.sierrawireless.com/t/dual-sim-switching-gpo-no-correct-work/1137 "2007-02-28T08:34:52Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Alex](https://avatars.discourse-cdn.com/v4/letter/a/db5fbb/32.png) [@Alex](https://forum.sierrawireless.com/u/Alex)\
**Post date:** [February 28, 2007, 8:34am UTC](https://forum.sierrawireless.com/t/dual-sim-switching-gpo-no-correct-work/1137/1 "2007-02-28T08:34:52Z")

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Hello.

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.  
Alex