Put your fingernail in the small slot at the bottom of the phone, lift and remove the cover.
If the battery is in the phone, lift it out.
Slide the SIM card in the SIM card slot.
Insert the second SIM
If you have a second SIM, slide it in the SIM2 slot. Both SIM cards are available at the same time when the device is not being used, but while one SIM card is active, for example, making a call, the other may be unavailable.