If you are not on an unlimited cellular or broadband connection, using a slow connection, or just want to limit the amount of data that your device consumes, iOS has a hidden feature to help you do just that.
The feature, called Low Data Mode, and there's a separate setting for both cellular data and your separate Wi-Fi connections.
Here's how it works.
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According to Apple, the way Low Data Mode works is dependent on the apps in question, and that you should expect the following:
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.
Apple's own apps also respond to being restricted to Low Data Mode as follows:
If that feels like an OK compromise to you, here's how you activate the feature.
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.
Enabling Low Data Mode on Wi-Fi.
Go to Settings > Cellular > Cellular Data Options and flip the switch on Low Data Mode.
If you have a dual-SIM iPhone, you have independent control over each data plan.