Data usage is important for two main reasons: While unlimited data plans are popular, exceeding limits often results in slow speeds. Some apps can send and receive a lot of data, which can raise privacy concerns.
Know your data plan’s limitations before you start exploring settings. Learn more on your carrier’s website or app.
Tracking your data:
Go to Settings > Cellular: This is where the data war happens.
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Cellular data: Turn off this setting to completely disable cellular data access for all apps (calls and SMS will continue to work).
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Cellular data options: Control access to data when roaming outside your carrier’s network.
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Data usage statistics: Scroll down to view your cellular and roaming data consumption for the current period.
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Application breakdown: Find out which apps are using too much data and tap the button to block them.
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System services: See how data is consumed when performing system operations such as push notifications and updates.
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Reset statistics: Start from scratch by clicking this option. Ideal for monitoring data usage over specific periods.
Source: Ferra

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