# Scrambled iOS Simulator Device IDs?

**URL:** <https://discuss.circleci.com/t/scrambled-ios-simulator-device-ids/9554>\
**Category:** Mobile\
**Tags:** ios\
**Created:** [January 12, 2017, 11:56pm UTC](https://discuss.circleci.com/t/scrambled-ios-simulator-device-ids/9554 "2017-01-12T23:56:44Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![alexey](https://sea2.discourse-cdn.com/circleci/user_avatar/discuss.circleci.com/alexey/32/42_2.png) [@alexey](https://discuss.circleci.com/u/alexey)\
**Post date:** [January 16, 2017, 10:50am UTC](https://discuss.circleci.com/t/scrambled-ios-simulator-device-ids/9554/2 "2017-01-16T10:50:30Z")

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Hello @jurvis, unfortunately yes, the simulator UUIDs have changed. We are very sorry for the trouble.

We have updated the docs to not to reference any simulator UUIDs at all—because of how easily the UUIDs can change we now suggest only using simulator names in your `circle.yml`.

We added an example of how to use simulator names both in the `xcodebuild` command and when pre-starting the simulator in [this post](https://discuss.circleci.com/t/os-x-build-image-update-xcode-8-2/9355). Could you please check the post out and let us know if using the simulator names works for you?

If there is any use case where you can _only_ use simulator UUIDs and not simulator names please let us know.

Thanks.

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_[View the full topic](https://discuss.circleci.com/t/scrambled-ios-simulator-device-ids/9554)._