The telephone number 07488 353986 is being used in the UK to place scam calls. The essence of this scam is that the caller pretends that they are calling from amazon to say that the recipient of the call has a parcel waiting for them and they need to pay postage using their banking details over the phone.
Of course there is no package, the caller.. THE SCAMMER.. is just trying to steal your personal and banking details for the purposes of committing fraud against you.
If you receive a call from this number then delete and block.