are you sure that your SIM isn't one of the multi cut "push out to size” type that you can make to the size you want?
Perhaps it was assumed that it was.
If not, you'll need to give the Virgin mobile team a call on 789. Or 0345 6000 789 from any other phone & request a new SIM of the correct size to suit your new upgrade phone.
If you want to say thanks > click 'Kudos'.Answered your question? > click 'Mark as Helpful Answer' also.