Open quick settings and tap Mobile data.

When you turn off cellular data, you can still use data over Wi-Fi.

Cellular data must be ON if you want to:

• Receive or send multi-media messages
• Share your phone’s internet connection with other devices

Data plans often have limits, and it's easy to exceed them. Setting up a usage warning can prevent surprises by alerting you when approaching your limit. You can even set a usage limit to turn off cellular data when it's reached, eliminating unexpected charges.

1. Go to Settings > Network & internet > SIMs & mobile network.

2. If needed, tap the SIM name.
3. Tap Data warning & limit.
4. To set a warning, turn Set data warning on , then tap Data warning and enter the amount of data.
5. To set a usage limit, turn Set data limit on , then tap Data limit and enter the amount of data.

Even when you’re not actively using them, most apps use data in the background to sync information and deliver notifications.

To conserve data when you’re running low, use Data Saver to turn off background data for all apps. You can also prevent specific apps from ever using background data, whether Data Saver is on or not.

Notifications stop: When you turn off background data for an app, you won't receive ANY notifications from the app until you open the app so it can sync.