How to Delete iMessage from a device with the same phone number I currently have

Cpoplock wrote:

I lost a iPhone 14 Pro . Got a new iPhone 14 Pro with the same phone number. How can I cancel iMessage on the first device and keep it on my new device with the same Apple ID account?

You can simply sign in to Messages on the new iPhone, it's not necessary to sign out of Messages on the old device. Regarding privacy, as long as you marked it as lost with Find My, rest assured the phone is nothing more useful than a brick.

If your iPhone or iPad is lost or stolen - Apple Support