Without this sim cutter, you need to cut the sim card by yourself. Firstly, you need to measure the sim card, remark part-lines on the card, then you hold a scissor to cut the card, you need to be careful to avoid broken the simcard. Many people had a try, it's high risk to broken the sim card.
With this sim cutter, all the measurement is accurately done for the cutter, you just need to input the SIM Card in correct way. we have guarantee for that, if there is any broken happened (follow the correct cut way), we will compensate for that!