Samsung SM-A310M User Manual page 15

Basics
Using 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 for
a single device.
Activating SIM or USIM cards
On the Home screen, tap Apps → Settings → SIM card manager. Select a SIM or USIM card
and tap the switch to activate it.
Changing the display name and icon of SIM or USIM cards
On the Home screen, tap Apps → Settings → SIM card manager. Select a SIM or USIM card,
and tap Name or Icon. Set a display name and icon for each card.
Setting preferred SIM or USIM cards
When two cards are activated, you can assign voice calls, messaging, and data services to
specific cards.
On the Home screen, tap Apps → Settings → SIM card manager and set the feature
preferences for your cards in Preferred SIM card.
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