Economical: copy 1-12 sim numbers. All GSM V1 system card can be copied. Complementary: Readable and re-writable to any number of different communication operator such as china mobile and china Unicom, strong signal, smooth communication, never miss any call. Never re-power on: when put magicsim card into the mobile and install STK function, it can switch another number automatically without power on the mobile to change card. Secret: with several numbers, different numbers to different people. Let you smooth in dealing with business & privacy, protect your private space without disturbing. Enable to deal smoothly in special business such as liability. Moreover, leave space to your lover & friends with anonymous sim card. Huge capacity: common mobile card just can store only 100 groups numbers, but you can get 250 groups numbers & 80groups short massages after installing Magicsim sim card with 12 numbers.