Hi
To find out the IMEI of your Samsung phone, sign in with your Google account on the Find your phone page: https://myaccount.google.com/find-your-phone

Then select your Galaxy phone. If it is turned on and with the GPS activated, its location will appear on a map. If not, click the information icon next to your phone and the IMEI will be displayed.

The procedure is valid for any Android phone. To know more, you can check our tutorial: https://en.alfanotv.com/android/how-to-find-a-lost-or-stolen-samsung-android-phone/