This is the ideal solution for geeks who travel. With this Dual SIM card adapter, you can switch to another operator by just a press of a button on the phone; ideal for making cheap calls with a local SIM, with out taking out the existing SIM card. It's simple to install, and you can switch to either SIM from the phone menu or it can be auto-switched after a set time (2/3/4/5/6/8/10/15/20/25/30 mins). Available from Mobile Brando HK for US $27.