Turn on Data saver
Use Data saver to reduce your data consumption by preventing selected apps from sending or receiving data in the background.
Connections > Data usage.
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From Settings, tap
mobile networks.
• Signal strength: View mobile signal strength.
• Network mode: You can select which network modes your mobile device can use.
• Access Point Names: Choose or add APNs, which have the network settings your device needs to connect to your provider.
• Network operators: Choose available and preferred networks.
• Network extenders: Scan for cells that can extend your network connection.
TIP Use these features to help manage connection settings that may affect your monthly bill.
Data usage
Check your current mobile and Wi-Fi data usage. You can also customize warnings and limits.
Roaming/Roaming state: Enable or disable data while roaming on other
VoLTE calls: Turn on enhanced communication using LTE.
• Data roaming access: Configure access to mobile networks while roaming.
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Connections > Mobile networks.
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From Settings, tap
Settings
Mobile networks
Use Mobile networks to configure your device's ability to connect to mobile networks and use mobile data. Options may vary by carrier.
1.From Settings, tap 
Connections > Data usage > Data saver.
2.Tap C> to turn on Data saver.
•To allow some apps to have unrestricted data usage, tap Allowed to use data
while Data saver is on, and tap 
next to each app to specify restrictions.
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