When you subscribe to a cellular service, you will receive a Subscriber Identity Module (SIM) card, with subscription details, such as your personal identification number (PIN) and optional services. To use UMTS or HSDPA services, you can purchase a Universal Subscriber Identity Module (USIM) card.
To install the SIM or USIM card and battery,
If the device is on, press and hold  and select Power off → OK to turn it off.
Remove the back cover.
Be careful not to damage your fingernails when you remove the back cover.
3 Insert the SIM or USIM card with the
Your device has two SIM card slots to allow you to use two SIM or USIM cards, and switch between them. Use the right slot for your primary, or most frequently used, SIM or USIM card. Use the left slot for a secondary SIM or USIM card.