How to enable Low Data Mode on iPhone and save mobile data
Mobile data can disappear faster than expected when an iPhone downloads app updates, synchronises photos, streams high-quality video and refreshes content in the background. Low Data Mode reduces that background activity, helping your monthly allowance last longer without requiring you to turn mobile data off completely.
The setting is useful for Australian iPhone owners using prepaid services, smaller data plans or mobile broadband while travelling. It can also help when you are outside reliable Wi-Fi, such as during a regional road trip or a commute between Sydney, Melbourne or Brisbane. You can apply it to mobile data, a particular Wi-Fi network, or both.
What Low Data Mode changes
Low Data Mode tells iOS and supported apps to use less network data. Automatic downloads and updates are paused, while some background tasks happen less frequently. Streaming quality may also be reduced, depending on the app and its own settings.
iCloud Photos synchronisation and iCloud backups can pause until the iPhone connects to a network without Low Data Mode. App Store downloads may wait, and some apps may stop refreshing their feeds in the background. These changes are designed to reduce usage when you are relying on a limited connection.
The setting does not make every app data-efficient. An app can still use mobile data when you open it, and video, music, maps and social media can consume substantial amounts during active use. Low Data Mode is a useful control, rather than a complete data-saving solution.
Your phone calls and SMS messages continue to work normally. Internet-based services such as FaceTime, WhatsApp, iMessage and live navigation still need data, although their performance or media quality may change.
Check your current mobile data usage
Before enabling the setting, check which apps are using the most data. Open Settings, tap Mobile, then scroll to the section showing mobile data usage by app. The exact labels can vary slightly between iOS versions and regional settings.
The usage figure is based on the period since the statistics were last reset. Tap Reset Statistics at the beginning of your billing cycle if you want a clearer monthly record. Your carrier’s app or website may provide the most accurate account of your remaining allowance, especially if your plan includes shared data across several services.
Video apps, social networks, cloud storage and podcast apps are common sources of high usage. Automatic photo uploads can also become expensive when you take many photos away from Wi-Fi. In Australia, this matters for prepaid customers and people using plans with data rollover or limited high-speed data before a slower service applies.
Check whether Wi-Fi Assist is enabled under Settings > Mobile. Wi-Fi Assist can switch to mobile data when a Wi-Fi connection is weak. It may be convenient, but it can use cellular data without being obvious, particularly on crowded home networks or public Wi-Fi.
Enable Low Data Mode for mobile data
To reduce cellular data use, open Settings and tap Mobile. If your iPhone uses a single SIM, tap Mobile Data Options. On some versions of iOS, you may see Cellular Data Options instead.
Turn on Low Data Mode. The change applies to the active mobile data connection. It does not automatically change every Wi-Fi network saved on your iPhone, so a separate Wi-Fi setting may be needed later.
If you use Dual SIM, eSIM and a physical SIM, choose the number that provides mobile data before opening its data options. Go to Settings > Mobile, tap Mobile Data, select the relevant line, then return to the mobile data options for that line. This is important when one line is an Australian number and the other is a travel eSIM.
Australia’s iPhone market includes many dual-SIM and eSIM users because travel eSIMs are convenient for overseas trips and secondary data services. Selecting the correct line prevents you from restricting one plan while the iPhone continues using another. You can also turn off Allow Mobile Data Switching if you do not want the phone changing between lines during a call.
Enable Low Data Mode for a Wi-Fi network
Low Data Mode can also be applied to individual Wi-Fi networks. This is useful for a personal hotspot, a capped home connection or hotel Wi-Fi where you want to limit background activity.
Open Settings > Wi-Fi, then tap the information button next to the connected network. Turn on Low Data Mode. iOS remembers the choice for that network, so the setting remains active when the iPhone reconnects later.
You can repeat these steps for other networks. A home Wi-Fi network in Perth, for example, can have a different setting from a phone hotspot used while travelling through regional New South Wales. Low Data Mode is stored per network rather than being a single global Wi-Fi switch.
To reverse it, return to the same Wi-Fi information screen and turn the option off. When you disable the mobile setting, use Settings > Mobile > Mobile Data Options and switch off Low Data Mode for the selected line.
What will still work on your iPhone
Low Data Mode does not block ordinary browsing, messages or app use. You can open Safari, check email, use maps and watch content manually. The main difference is that iOS and compatible apps become more restrained when working in the background.
Automatic App Store updates and automatic downloads may pause. To check those controls, open Settings > App Store and review App Downloads, App Updates and downloads using mobile data. If an app update is urgent, you can usually open the App Store and start it manually when you have suitable Wi-Fi.
Streaming services may lower audio or video quality to reduce bandwidth. Individual apps can override or supplement Apple’s controls, so check settings in services such as YouTube, Netflix, Spotify, Apple Music and podcast apps. Downloading music, films, podcasts or map areas over Wi-Fi is often more effective than relying on Low Data Mode alone.
Background App Refresh may be reduced, and iCloud activity can wait. If you are expecting a large photo library to upload, connect to a normal Wi-Fi network and power, then allow the process to finish. Low Data Mode is helpful for daily savings, but it can delay cloud synchronisation.
Troubleshoot delayed updates and syncing
The most common surprise is that an app or photo library appears to be stuck. First check whether Low Data Mode is active on the current connection. For mobile data, go to Settings > Mobile > Mobile Data Options. For Wi-Fi, open Settings > Wi-Fi, tap the network information button and inspect the setting.
If you need an update immediately, connect to a Wi-Fi network without Low Data Mode. You can also turn the feature off temporarily, complete the download, then enable it again. This avoids changing several app settings individually.
If mobile data still seems unusually high, review Settings > Mobile and turn off cellular access for apps that do not need it. Photos, App Store, iCloud Drive and video services deserve particular attention. You can also disable Wi-Fi Assist if your Wi-Fi connection is generally reliable.
A carrier warning is worth taking seriously. Australian providers such as Telstra, Optus and Vodafone may display usage alerts through their apps, but the figures can differ slightly from the iPhone’s counter. Billing cycles and network reporting periods do not always match. If a service charges for unexpected excess usage, keep the usage records and contact the provider. The Australian Consumer Law provides consumer guarantees for products and services, although it does not prevent every charge associated with a plan you agreed to.
Choose the right settings for your routine
Low Data Mode works best when paired with a few practical habits. Set apps to download content over Wi-Fi, reduce video quality when streaming on mobile data, and remove automatic playback from social media feeds. Offline maps and downloaded playlists are particularly useful before driving in areas with patchy coverage.
If you have a generous unlimited or high-capacity plan, leaving Low Data Mode off may provide a smoother experience. If your plan has a small monthly allowance, using it on mobile data can reduce background consumption. A capped home internet service or hotspot may justify enabling it for one Wi-Fi network as well.
The setting is especially useful for people who tether an iPhone to an iPad or laptop. Personal Hotspot can consume data rapidly through operating-system updates, cloud drives and web pages designed for desktop screens. Enable Low Data Mode on the connected device where possible, and avoid allowing automatic updates during a hotspot session.
| Situation | Recommended setting | Reason |
|---|---|---|
| Small prepaid mobile allowance | Turn on for mobile data | Reduces background downloads and syncing |
| Large mobile plan with ample data | Optional | Keeps background updates convenient |
| Travel eSIM with a fixed allowance | Turn on for the eSIM line | Protects the travel data bundle |
| Personal Hotspot for a laptop | Turn on for the hotspot network | Limits desktop background activity |
| Home Wi-Fi with no practical data cap | Usually leave off | Allows faster syncing and updates |
| Hotel or public Wi-Fi with restrictions | Turn on for that network | Reduces unexpected background traffic |
| Waiting for iCloud Photos to sync | Temporarily turn off on trusted Wi-Fi | Allows uploads and backups to continue |
Review the setting after changing plans, SIMs or home internet services. A new eSIM may become the active mobile data line, and a replacement router may appear as a new Wi-Fi network. These changes can make an old data-saving setup irrelevant without being obvious.
Use Settings > General > Software Update to keep iOS current when you have suitable Wi-Fi. Apple can adjust network behaviour between releases, and current software is important for security, compatibility and reliable cellular features. Low Data Mode should support your routine rather than replace regular checks of your plan and app usage.
Enable Low Data Mode through Settings > Mobile > Mobile Data Options before your next billing cycle, then check Settings > Wi-Fi for networks that need separate protection. A few minutes spent reviewing app access, streaming quality and hotspot behaviour can make a limited Australian data plan last considerably longer.