how can i check what devices are using my icloud
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The following has information on how you can see some (but not necessarily all) devices signed into your iCloud: Check your Apple ID device list to see where you're signed in - Apple Support
If you are asking because you think your Apple ID may have been compromised, the following may also help: If you think your Apple ID has been compromised - Apple Support
You may also want to activate two-factor authentication: Two-factor authentication for Apple ID - Apple Support