how to find my IMEI if my iPhone stolen

Login to your Apple Account.

https://account.apple.com/

Look in “Devices” tab.

If you have the original box that the iPhone came in, the IMEI and Serial Number are on the box.

You could also contact your carrier to retrieve the IMEI number.

Bob Timmons wrote:

If you have the original box that the iPhone came in, the IMEI and Serial Number are on the box.

I thought Apple stopped doing that quite some time ago since it resulted in some fraud schemes.

iCloud User Guide - Apple Support

"You can’t see a device’s complete serial number on iCloud.com, but there are other ways you can find it:

On an iOS or iPadOS device: Go to Settings > [your name], then select a device.

On your Mac: Choose Apple menu > System Preferences/Settings, then do one of the following:

macOS Catalina 10.15 and later: Click Apple ID, then select a device.

Your cellular service provider has the number. Some will disclose the number to the account owner and some will not disclose the number.

Re: “… I thought Apple stopped doing that [printing IMEIs on-box ] quite some time ago … “

FWIW as a single data-point …

…. our most recently purchased iPhone — an SE3 purchased directly from Apple fifteen months ago — still had BOTH IMEIs printed on-box.

If there’s a vulnerability, there are criminals ready to exploit it.

I’d think that socially-engineered voice calls to Level 1 CSRs at carriers with sketchy subscriber authentication might be the greater risk.

Maybe IMEIs are less of a concern. I remember several years ago reading about somebody who was using serial numbers in a massive fraud scheme.