My iPhone 12 is lost and I need IMEI number for this device

Follow the instructions at https://support.apple.com/en-us/HT201472

Apple can not provide you w/ your IMEI via this forum.

However you can obtain it yourself under your “Devices” at https://appleid.apple.com/

Other methods are described from link at “Related Article.”

my iPhone 8 s lost and i need IMEI number for this device. Please help

got it

As others have posted, an IMEI will not help you find your phone via Apple, however …

Login to your AppleID via https://appleid.apple.com/

Scroll down to your “Devices” and your IMEI will be listed.