Regarding the detection of stolen phones via IMEI, I decrypt Andrei’s answer:
even if BH detects your phone (which, of course, will cost a certain amount of money), the question becomes: "How to return the phone?". There are solutions to the problem:
1) convince the new owner to return the phone - the most ideal option, but unlikely, because a bona fide acquirer (a person who did not know that he was acquiring the stolen property) who paid money for him is unlikely to want to do this voluntarily and free of charge, and the buyer or thief is unlikely to admit that he illegally acquired the phone;
2) take away , but this option can lead to negative consequences for participants in such an action, because it falls within the scope of articles of the Criminal Code of the Russian Federation at least “arbitrariness”, and as a maximum “robbery”
3) seize with the help of the police . Unfortunately, Russian law regulates this issue not in favor of the original owner. The police can seize the phone, but she will not return it to you (only if you give a bribe to the opera, it’s a waste again)
4) in civil proceedings Prove that you own the phone. We recall the bona fide purchaser.
All these chores will take you a lot of your time, effort, nerves, not to mention money.
This is exactly what Andrei had in mind when he said that a new phone would be cheaper to buy.