Instructions: 1) Ultra slim design: 15 x 25 x 0.9mm 2) 2-in-1 design and installation after cards cutting 3) 3 automatic network switch speeds: fast, mid, slow, and no need to turn on / off the phone 4) No data loss when switching 2 numbers or turning on / off the phone 5) Imported FPC board of high quality and advanced IC technology adopted 6) Compatible with all of GSM mobile Installation: 1) Stick to adhesive label on the SIM card and cut along the visible line 2) Put your cut SIM cards into the slots of general dual SIM cards, then insert steel sheet 3) Put the general dual SIM card in your handset instead of your regular SIM1 card 4) Turn on your mobile phone and one of the two SIM cards will be active