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

I received this message on my iPhone 6S+. We have 2-step verification enabled so I immediately changed the password. As soon as my husband signed into the Apple ID on his phone, I received the message again. His phone is not using my phone number. Could someone have hacked our account that quickly?

I have received this message a couple of times recently, come to think of it, after recent updates. It would be HELPFUL if Apple put out a notice indicating a message like this might appear after updates instead of leaving us all to try to troubleshoot the issue! This is the second time in recent weeks I've been checking it out. I felt safe once I checked out my Apple account and viewed connected devices and was able to see that those connected were indeed MY devices. I also have two step verification enabled. Wouldn't have the account without it these days!

I've had 2SV set up for a number of months. Nothing has changed with my setup on any of my devices, and I just received the same message. Are you sure there's not some hack around 2SV? I've just now changed my password to be sure.

Thanks.

You will get a message like that any time iMessage reauthorizes. After an update, for example, or if you change any iMessage or FaceTime settings.

I just got the same message when I got on my MacBook Pro this morning, trying to figure it out as well.

Any time you add a device to your iCloud Apple ID you will receive a notification like that. If you get such a notification and you have NOT logged in to iCloud with a new device and not changed any iCloud settings on any device it's possible that your iCloud ID was hacked. Change your password for your Apple ID (see: Change your Apple ID - Apple Support) and consider adding 2 factor authentication to your iCloud account.

My iPad 2 has just received the same message and I haven't made any changes to my trusted devices. I have 2-step authentication enabled, and have done so for a while now.

I would recommend, as Lawrence Finch has, to change your password in the first instance, and definitely enable 2-step authentication if you've not done so already.

Your account was not hacked if you have 2SV. Do you share an Apple ID? Is your phone on the list of devices authorized to verify 2SV?

This message may come up if you "disable" then later "re-enable" iMessage on one of your iOS devices.

I get this message on my MacPro if I take this action on my iPhone 7S.