Assembling11Install the SIM or USIM card and batteryWhen you subscribe to a cellular service, you will receivea Subscriber Identity Module (SIM) card, with subscriptiondetails, such as your personal identification number (PIN) andoptional services. To use UMTS or HSDPA services, you canpurchase a Universal Subscriber Identity Module (USIM) card.To install the SIM or USIM card and battery,If the device is on, press and hold [1 ] and select Poweroff → OK to turn it off.Remove the back cover.2Be careful not to damage your fingernails when youremove the back cover.Insert the SIM or USIM card with the gold-coloured3 contacts facing down.Your device has two SIM card slots to allow you to use twoSIM or USIM cards, and switch between them. Use theright slot for your primary, or most frequently used, SIMor USIM card. Use the left slot for a secondary SIM or USIMcard.