Iphone 6 plus protection

SIR/MADAM, I AM NOT AT ALL FAMILIAR WITH MY NEW IPHONE six PLUS. BUT I AM VERY AWARE OF SECURITY THREATS , I. D. THEFT. AND THE LIKE. SO I WOULD LIKE TO ASK ALL OF YOU VERY NICE INDIVIDUALS IF ANYONE WHO DOES HAVE AN IPHONE 6 PLUS TO RECOMMEND A PRODUCT YOU YOURSELF USE. I WOULD BE ETERNALLY GRATEFUL. THANK YOU SO MUCH!