# EM7455 AT command to change SIM card PIN

**URL:** <https://forum.sierrawireless.com/t/em7455-at-command-to-change-sim-card-pin/15146>\
**Category:** MC/EM Series\
**Created:** [January 23, 2019, 9:32pm UTC](https://forum.sierrawireless.com/t/em7455-at-command-to-change-sim-card-pin/15146 "2019-01-23T21:32:26Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![dchou4u](https://avatars.discourse-cdn.com/v4/letter/d/e9a140/32.png) [@dchou4u](https://forum.sierrawireless.com/u/dchou4u)\
**Post date:** [January 23, 2019, 9:32pm UTC](https://forum.sierrawireless.com/t/em7455-at-command-to-change-sim-card-pin/15146/1 "2019-01-23T21:32:26Z")

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Hi, I know the MC7455 has the +CPIN command to input the PIN of the SIM card. Is there a AT command to actually change the PIN on the SIM card?

Thanks

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**Author:** ![Thor](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.sierrawireless.com/thor/32/3889_2.png) [@Thor](https://forum.sierrawireless.com/u/Thor)\
**Post date:** [January 24, 2019, 12:34am UTC](https://forum.sierrawireless.com/t/em7455-at-command-to-change-sim-card-pin/15146/2 "2019-01-24T00:34:03Z")

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at+clck=“SC”, 1, “1234” // set SIM (“SC” pin to “1234”  
OK  
at+clck=“SC”, 2 // check lock status, 1 - locked  
+CLCK: 1

OK  
at+CLCK=“SC”, 0, “1234” // unlock with current PIN  
OK  
at+clck=“SC”, 2 // check lock status, 0 - unlocked  
+CLCK: 0

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<div class="post-metadata">

**Author:** ![dchou4u](https://avatars.discourse-cdn.com/v4/letter/d/e9a140/32.png) [@dchou4u](https://forum.sierrawireless.com/u/dchou4u)\
**Post date:** [January 24, 2019, 1:15am UTC](https://forum.sierrawireless.com/t/em7455-at-command-to-change-sim-card-pin/15146/3 "2019-01-24T01:15:02Z")

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Thank you so much for your reply.

I believe the commands you wrote show how to lock and unlock the SIM.

Is the command to change the password from 1234 to 1111 this… AT+CPWD=“SC”,“1234",“1111”

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<div class="post-metadata">

**Author:** ![Thor](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.sierrawireless.com/thor/32/3889_2.png) [@Thor](https://forum.sierrawireless.com/u/Thor)\
**Post date:** [January 24, 2019, 5:55pm UTC](https://forum.sierrawireless.com/t/em7455-at-command-to-change-sim-card-pin/15146/4 "2019-01-24T17:55:22Z")

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You can use the AT+CPWD command to change the PIN.