- How To Activate Low Data Mode On iPhone or iPad
- How To Minimise Data Usage On Your iPhone or iPad
Apple revealed how the Low Data Mode works on their devices and note that you should experience the following..

- Apps might stop using network data when you're not actively using them.
- Background App Refresh is turned off.
- The quality of streaming content might be reduced.
- Automatic downloads and backups are turned off.
- Services such as iCloud Photos pause updates.
It's worth noting that third-party apps such as Google Chrome or the YouTube app will not change how much data it downloads as a result of this setting, expect that background refresh will be disabled.
Meanwhile...Apple's own apps also respond to being restricted to Low Data Mode in different ways, which is as follows...
- App Store: Video autoplay, automatic updates, and automatic downloads are turned off.
- Music: Automatic downloads and high-quality streaming are turned off.
- Podcasts: The frequency of feed updates is limited, and episodes are downloaded only on Wi-Fi.
- News: Article prefetching is turned off.
- iCloud: Updates are paused, and automatic backups and iCloud Photos updates are turned off.
- FaceTime: Video bitrate is optimized for lower bandwidth.
Low Data Mode With Wi-Fi
Go to Settings > Wi-Fi and from the list find the relevant Wi-Fi connection, and then tap on the "i" to bring up the information screen about the connection. From there, flick the switch on Low Data Mode.

Remember that each Wi-Fi connection you use will have its own independent Low Data Mode setting, so setting it for one does not influence another.
Low Data Mode With Cellular
Go to Settings > Cellular > Cellular Data Options and flip the switch on Low Data Mode.
Also keep in mind If you have a dual-SIM iPhone, you have independent control over each data plan.
