Based on the area code “020”, which stands for London, the caller ID number “2045996818” seems to be from the United Kingdom. It is important to keep in mind, though, that phone numbers can be faked or changed, so the number that is shown might not always properly reflect where the call came from or who is calling. If you think this number is involved in any kind of suspicious behaviour, you should not talk to them and might want to report it to the police or your phone carrier.
