Product info: Super ghost sim - NEW FEATURE! Switch between sims via the phone's menu! - NEW FEATURE! Option to auto switch between sims every 1-99 minutes - use the manual sim selection option if you don't want to auto switch - allows you to use two sim cards in one phone - no need to cut your sim card like with similar products - more convenient than removing your back cover/battery every time you want to swap sim cards - combine business/personal lines and address books on one handset - switch between networks easily - no more coverage problems! - take advantages of cheaper rates from different phone companies - saves your previous calls, received calls, time and date settings etc. - new ultra slim design - sits inbetween your battery and back cover - no need to replace your phone's back cover - the ghost sims sit inbetween your battery and standard back cover - works with all sims (including 3) - can be used to add another 200 contacts to your phone book via the second sim card (sim dependent) - works with virtually all makes and models How they work: the pseudo sim card from the product fits into sim slot on your phone whilst your two sim cards fit into the ghost sim. When you turn your phone you will be prompted to select the network or sim you wish to use. Your phone then operates as usual but allows you to switch between two sims without removing the battery and back cover first. To alternate between sims select the option in your phone's menu (the product adds this function to your menu). The phone will display the "insert sim card" message for a few seconds then swap over to the other sim. Click here for a complete guide on use