"Your phone number is now being used for iMessage on a new iPhone”

[Kiki61]

Woke up this morning and just got this message via my MacBook Air. Needless to say I freaked, so I went into my iPhone and checked, and there were no unknown devices listed. I went ahead and changed my the password for my Mac ID (via the phone security setting itself). I did have 2FA enabled in the settings on my iPhone. I checked my iCloud accounts, and there are no unknown devices listed.

Was my account hacked? As before, how can I tell if someone has gotten into my Apple accounts, or was this just a delayed message via my MacBook (my phone is about 6 months old). Would changing the phone SIM card out help?

 

[rambo47]

Any time a new device is registered on your iCloud account you get those warnings. I've gotten them after major OS upgrades/updates on my iPad.

You can sign into iCloud.com in a web browser and see all the devices registered on your account.

 

[crawfish963]

I have been getting these daily for about 2 weeks. And they are all my devices. I have no unusual sign-ins on my account and I changed my password as well. Driving me nuts.

 

[addamas]

I had this message which was caused by logging into old Mac I have when I have not used for a long time. I have no idea how long it takes to mark device as “not valid” but this pop up / message is shown because of this.