I received 2 new sensors today for my freestyle libre. Also included was a Pop Socket, but no explanation of what it is. All it says is 'you can stick this to the back of your phone'. I phoned Abbots to ask what it was for, the person answering the phone said they did not know and would find out. He then came back and said it was it make it easier to hold your phone. Has anyone received one if these and used it?