# MC7750 and \`CME ERROR: SIM wrong\` with various SIM cards

**URL:** <https://forum.sierrawireless.com/t/mc7750-and-cme-error-sim-wrong-with-various-sim-cards/29466>\
**Category:** Legacy AirPrime modules\
**Tags:** debug\
**Created:** [April 6, 2023, 9:39pm UTC](https://forum.sierrawireless.com/t/mc7750-and-cme-error-sim-wrong-with-various-sim-cards/29466 "2023-04-06T21:39:09Z")\
**Posts on this page:** 1\
**Showing post:** 11

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**Author:** ![cbldbssr](https://avatars.discourse-cdn.com/v4/letter/c/d6d6ee/32.png) [@cbldbssr](https://forum.sierrawireless.com/u/cbldbssr)\
**Post date:** [May 21, 2025, 7:25am UTC](https://forum.sierrawireless.com/t/mc7750-and-cme-error-sim-wrong-with-various-sim-cards/29466/11 "2025-05-21T07:25:31Z")

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FYI, I’ve also asked in different thread is my modem locked in any way at [Is my Sierra Wireless MC7750 locked in any way?](https://forum.sierrawireless.com/t/is-my-sierra-wireless-mc7750-locked-in-any-way/34953)

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