This is a smart card , a promotional product . 6 numbers in 1 card (Invisible IP multi card) Function: 1) 1 to 6 numbers (different countries and different dealers can share one card by copying) All GSM V1 system card can be copied 2) Invisible Number Function, SIM1 switch to SIM2, while SIM1is invisible. When someone dialed sim 1, System tone noticed "The number you dialed can''t connect at a moment, please dial later" 3) Auto switch online (Two times auto switch, the time is 00: 00). Sim1桽et time 00: 00 Sim2-- Set time 00: 00 4) IP Dialing Device Two groupe routes set ( For example: 17909) Two groups condition set ( For example: 00 ) 5) Enlarge Phone Book 250 Groups 6) Enlarge Message 80 Groups 7) Set number freely on screen (for example: 13682234567 on your mobile) 8) Record of calling memory (little mobile can''t support to this function) 9) 13th extended card can hold Multi card and V2 card. (Enclosed 13th extended card ) 10)Improved and newest technology, Extremely fast to switch numbers