I cut mine down with a pair of scissors the 1st day I had my Note 2, couldn't wait to use it lol, it worked fine but I went to my local O2 shop next day to get a micro sim which was free of charge. Most new sims now come with a normal sized sim with an insert that you can break off into a micro sim, its up to you if you cut it down at the end of the day, but try contacting your carrier, they may provide a free one.