- If you have a dual-SIM phone, slide the SIM card holder of the SIM2 slot to the right and open it up.
- Place your second SIM in the slot.
- Close down the holder, and slide it to the left to lock it in place.
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