How do I know if someone is using my iCloud from a different device

ShavonaGaines Said:

"How do I know if someone’s using my iCloud on a different device and sending messages from my iCloud"

-------

Verify the Devices:

Verify that the devices assigned to your iCloud are your devices: Check your Apple ID Device List to See where you're Signed in - Apple Support. If something looks not to be your device, then someone may have your credentials and you need to secure your account.

Modify your Credentials:

Having so much suspicion, consider modifying your credentials, ASAP, starting with a new password.

• Modify: your login credentials (using both a New eMail and a New Password) for Apple and each and all sites
• Associate: a different method of payment to your account
• Enable: Two-Factor Authentication for Apple ID PayPal and for all other accounts that have such an applicable option

That's unlikely unless you've given someone your username and password. If you think your Apple ID has been compromised, follow these steps: https://support.apple.com/en-us/HT204145