17th Generation MagicSIM card (manufacturer claimed) - 500 entries SIM card phone book storage: 250 regular + 250 STK encrypted/secure phone book - Calling card prefix auto dealing (STK feature) - Stores up to 50 SMS messages on SIM - 128K high quality writable SIM card (software and USB reader/writer included) - USB reader/writer included - Automatic dual operator / dual phone number stand-by features (periodically switches between specified phone numbers so that you can accept calls from both numbers) - Change active phone number without rebooting the cell phone - Call history not affected by changing between phone numbers . - Note: the included software scans your existing operator's SIM card for the internal Ki number (i.e. an operator password). Not all Ki number can be scanned. DX did not manufacture this product so we suggest you to research on this device before purchasing. CD: http://m5.img.dxcdn.com/CDDriver/CD/sku.12425.rar