# SL8082BT with dual sim

**URL:** <https://forum.sierrawireless.com/t/sl8082bt-with-dual-sim/7737>\
**Category:** Legacy AirPrime modules\
**Created:** [February 4, 2015, 6:25am UTC](https://forum.sierrawireless.com/t/sl8082bt-with-dual-sim/7737 "2015-02-04T06:25:30Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![siem](https://avatars.discourse-cdn.com/v4/letter/s/c89c15/32.png) [@siem](https://forum.sierrawireless.com/u/siem)\
**Post date:** [February 4, 2015, 6:25am UTC](https://forum.sierrawireless.com/t/sl8082bt-with-dual-sim/7737/1 "2015-02-04T06:25:30Z")

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Hi everyone,

I use the SL8082BT with two SIM cards.  
At one time, switching algorithm I discussed on the SW forum ,

[https://forum.sierrawireless.com/t/dual-sim-for-sl8082/6786/5](https://forum.sierrawireless.com/t/dual-sim-for-sl8082/6786/5)

and it is perfectly  
worked with SL8082 modules. Now with SL8082BT stopped working.

The behavior of the two modules in this algorithm:

SIMLPM=2 option is set (at!custom=“SIMLPM”,2)  
Module works with the first SIM card at power on.

------ SL8082 -----

1. at + cfun = 4  
output VREG\_USIM remains high
2. at!dio = 1,1  
switching between SIM interface occurred, VREG\_USIM some time  
remains on, then proceeds to zero.
3. at + creg = 1,0  
VREG\_USIM quickly switched on and the module starts with  
second SIM card  
Checking at!iccid? confirms switching to second SIM.

------ SL8082BT -----

1. at + cfun = 4  
output VREG\_USIM remains high
2. at+wiow = “GPIO1”, 1  
switching between SIM interface occurred, VREG\_USIM some time  
remains high, then proceeds to zero.
3. at + creg = 1,0  
VREG\_USIM power does not turn on  
Checking at!iccid? naturally gives ERROR.

Each SIM interface individually working fine. Does not work  
switching algorithm only. To switch SIMs FSA2567MPX is used.  
And yet, when exiting LPM should not be software reset, because the sim selection is performed directly gpio1.

Any ideas on this subject