# \[HL8549\] - Dual SIM - Change SIM Slots

**URL:** <https://forum.sierrawireless.com/t/hl8549-dual-sim-change-sim-slots/14553>\
**Category:** Legacy HL Series\
**Created:** [November 21, 2018, 11:35pm UTC](https://forum.sierrawireless.com/t/hl8549-dual-sim-change-sim-slots/14553 "2018-11-21T23:35:19Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![littlekernel](https://avatars.discourse-cdn.com/v4/letter/l/ee59a6/32.png) [@littlekernel](https://forum.sierrawireless.com/u/littlekernel)\
**Post date:** [November 21, 2018, 11:35pm UTC](https://forum.sierrawireless.com/t/hl8549-dual-sim-change-sim-slots/14553/1 "2018-11-21T23:35:19Z")

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Hi.,

I’m using the **HL8549** module with two SIM cards slot (_SPDT Switch enabled_).

1. I’ve selected the first slot (SIM1) and registered on the network;

2. I’ve changed to the SIM2 through the command “AT+KSIMSEL=2”;

3. The command “CPIN?” returns: [AT+CPIN?][+CME ERROR: 10;][010] - That means “SIM not inserted”.

4. But reading the SIM presence status through the “AT+KSIMSEL=4” command returns [AT+KSIMSEL=4][+KSIMSEL: 4,1,1;;OK;][000] - That means First and Second external SIM is present.

Can anybody help me?

Thanks.

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**Author:** ![Sierra\_klin1](https://avatars.discourse-cdn.com/v4/letter/s/8e7dd6/32.png) [@Sierra\_klin1](https://forum.sierrawireless.com/u/Sierra_klin1)\
**Post date:** [November 28, 2018, 11:12am UTC](https://forum.sierrawireless.com/t/hl8549-dual-sim-change-sim-slots/14553/2 "2018-11-28T11:12:06Z")

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Hi littlekernel,

For DSSS feature, please refer to the application note in source: (Make sure the correct hardware connection before the test)  
[https://source.sierrawireless.com/resources/airprime/application\_notes\_and\_code\_samples/airprime\_hl\_series\_dual\_sim\_single\_standby\_application\_note/](https://source.sierrawireless.com/resources/airprime/application_notes_and_code_samples/airprime_hl_series_dual_sim_single_standby_application_note/)

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**Author:** ![durgapasad](https://avatars.discourse-cdn.com/v4/letter/d/a88e4f/32.png) [@durgapasad](https://forum.sierrawireless.com/u/durgapasad)\
**Post date:** [April 24, 2019, 12:05pm UTC](https://forum.sierrawireless.com/t/hl8549-dual-sim-change-sim-slots/14553/3 "2019-04-24T12:05:39Z")

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hi will you please tell me , how to switch between two sims  
thanks