A new scam that is doing the rounds involves you receiving a package from a courier which contains a brand new mobile phone. Shortly afterwards you get a visit from another ‘courier’ saying that the parcel was delivered in error. Under no circumstances should you give it back. What’s happened is you have had enough of your information stolen for a mobile phone to be ordered on a contract in your name. The crooks try to intercept the phone in transit but if they can’t they ask you to give it to them as they pose as a courier. without the phone you are liable for the contract which could run into hundreds of pounds.
More on this story from the BBC
https://www.bbc.co.uk/news/business-49450485