This site allows you to check the status of a phone’s IMEI information and even report or check if it was stolen, lost or blocked
This is useful not only if you are buying a second-hand phone to check that the IMEI matches the actual description of the phone (it's not fake) but also if it was reported lost or stolen or is blacklisted (or blocklisted now). I'm not sure how widely the site is retrieving the info, but it...
