I use the dual sim card without cutting, it works with all the GSM card, it has the following features:
1) Switch online or Auto-switch online without turning on-off. Max 99
minutes available for you to self-set auto-switching time(unique)
2)No data lose when switching 2 numbers or turning on-off
3)Super slim design with special general dual sim card IC for stable quality
4) Show the active Phone Number on the screen
5) Compatible with all GSM cards (including USA the latest 1900HZ sim
cards), No need to cut the sim card,TWO SHAPES, BEST COMPATIBILITY.
I bought it from Taiwan based company, if you have interest, you can visit their website www.magicsim.com