Introduction Work with GSM SIM card. Easy to be installed. No need to punch the SIM card, just attahch to the SIM card. Could store 3 access numbers, and the there accesses are optional. Could reroute user’s call after programming the specified access number Could set prefix go though or by pass the dialer Support three working mode: a. call through before connection establish b. call through wait for connection establish c. call back No need to change user’s conventional dialing habit: a. Support dial from the Contacts and phone book, no need to memorize and input the numbers. b. Support dial directly from mobile phone's missed calls/ call record/ call history/ recent calls. Compatible with many mobile phones, Nokia, Motorola, Sony Ericsson, Samsung, LG, and so on.