Getting started14Using dual SIM or USIM cards (dual SIM models)If you insert two SIM or USIM cards, you can have two phone numbers or service providers fora single device.Activating SIM or USIM cardsOn the Home screen, tap → Settings → SIM card manager. Tap one or both of theswitches for the SIM or USIM cards to activate them.Changing the display name and icon of SIM or USIM cardsOn the Home screen, tap → Settings → SIM card manager. Select a SIM or USIM card andtap Name or Icon. Set a display name and icon for each card.Switching between cardsWhen two SIM or USIM cards are activated, card selection icons appear on the dashboard ofthe notifications panel. Open the notifications panel and then select a card.Charging the batteryUse the charger to charge the battery before using it for the first time. A computer can be alsoused to charge the battery by connecting them via the USB cable.Use only Samsung-approved chargers, batteries, and cables. Unapproved chargers orcables can cause the battery to explode or damage the device.• When the battery power is low, the battery icon appears empty.• If the battery is completely discharged, the device cannot be turned onimmediately when the charger is connected. Allow a depleted battery to charge fora few minutes before turning on the device.• If you use multiple apps at once, network apps, or apps that need a connectionto another device, the battery will drain quickly. To avoid disconnecting from thenetwork or losing power during a data transfer, always use these apps after fullycharging the battery.