From Android 7.0 (API level 24), users can enable Data Saver on a device-wide basis in order to optimize their device’s data usage, and use less data.

This ability is especially useful when roaming, near the end of the billing cycle, or for a small prepaid data pack.

Should my data saver be on or off?

Once you’ve turned on Android’s Data Saver feature, you can pick which apps (like Gmail) that can continue to use background cellular data. That’s why you should turn on Android’s Data Saver feature immediately. Bonus tip: You’ll need to turn Data Saver off before using your Android phone as a mobile hotspot.

What does data saver do on Android phone?

Prevent apps from being interrupted when there’s no Wi-Fi. Some apps and services won’t work as expected without background data. You can let certain apps and services continue getting background data via mobile data in data saver mode. Tap Network & internet Data usage Data saver Unrestricted data.