Sim Card Manager (Dual Sim Models); Mobile Networks - Samsung Galaxy J2 User Manual

Settings
Limiting data usage
1
On the Settings screen, tap Data usage and tap the Set mobile data limit switch to
activate it.
2
Drag the limit adjustment bar upwards or downwards to set the limit.
3
Drag the warning adjustment bar upwards or downwards to set a data usage alert level.
The device will alert you when the warning level is reached.

SIM card manager (dual SIM models)

Activate your SIM or USIM cards and customise the SIM card settings. Refer to
or USIM cards (dual SIM models)
On the Settings screen, tap SIM card manager.
Voice call: Select a SIM or USIM card for voice calls.
Text and multimedia messages: Select a SIM or USIM card for messaging.
Data service network: Select a SIM or USIM card for data service.
Dual SIM always on: Set the device to allow incoming calls from the other SIM or USIM
card during a call.
When this feature is enabled, you may incur additional charges for call forwarding
depending on the region or service provider.

Mobile networks

Configure your mobile network settings.
On the Settings screen, tap Mobile networks.
Data roaming: Set the device to use data connections when you are roaming.
Access Point Names: Set up access point names (APNs).
for more information.
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Using dual SIM