Text Message Alert
I received a text message on my Iphone that my Apple ID and phone number was being used by another Ipad device, what shall I do?
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Try checking your device list to see if there is an unrecognized device.
Apple ID device list -Check to see where you‘re signed in
As a precaution, change your password.
What to do after you change your Apple ID or password - Apple Support I suggest doing this before you change your Apple ID or password.