Now most people like to use dual sim cards in one phone.  With dual sim cards in a single mobile phone, you can own a personal and a business number at the same time. Mobile phones supporting dual sim cards dual standby allow you to switch easily between two SIM cards and you don't have to take them out and swap them physically.

You can find lots of dual gsm phones in mobile-phones.cn. Quad band gsm phones dual cards dual standby, tri-band gsm phones dual cards dual standby, Quad band gsm phones dual cards single standby, tri-band gsm phones dual cards single standby and other kinds of dual sim gsm phones are all available. Good choice to buy gsm mobile phones here!