How to Use Data Saver Mode: Android, iPhone and Samsung Galaxy (2026)

Illustration for how to use data saver mode

By Chester Takau · Updated September 2026

On most Android phones, Data Saver is a single toggle: open Settings → Network & internet → Data Saver and switch it on. On a Samsung Galaxy, the same switch sits at Settings → Connections → Data usage → Data saver. On iPhone the feature is called Low Data Mode: Settings → Cellular → Cellular Data Options → Data Mode → Low Data Mode.

Once it's on, your phone blocks apps from using mobile data in the background unless you explicitly allow them — which is where most monthly allowances quietly disappear. The trade-offs are real too: some notifications arrive late, and some apps serve lower-resolution images. The sections below cover each platform step by step, which apps to whitelist, Samsung's new Adaptive Data Saver, and what to do when the toggle misbehaves.

Data budget calculator: do you need Data Saver this month?

Enter your plan details to see your daily budget and whether you're on track to run out before your cycle resets.

Monthly allowance (GB)

Used so far (GB)

Day of cycle you're on

Cycle length (days)

What Data Saver mode actually does on your phone

Data Saver draws one line: apps you're actively looking at can use data; apps in the background can't. Per Android's official documentation, the system flags the connection as restricted and well-behaved apps are expected to hold off on background sync, prefetching and automatic downloads until you open them or connect to unrestricted Wi-Fi.

That distinction explains the two most common complaints. First, delayed notifications: an email or messaging app that isn't whitelisted can't poll its servers in the background, so messages land when you next open the app. Second, fuzzy images: some apps detect the restricted connection and deliberately serve compressed, lower-resolution media. Data Saver does not throttle your connection speed, and it never restricts the app currently on your screen.

How to turn on Data Saver on Android (Pixel and stock Android)

Open Settings.
Tap Network & internet, then SIMs if your phone asks which line to configure.
Tap Data Saver.
Toggle Use Data Saver on. A Data Saver indicator appears in the status bar while it's active.

To let specific apps keep working in the background, go back into Data Saver → Unrestricted data and toggle on the apps you trust — more on choosing those below. Google's Pixel Phone Help page documents the same path. The toggle itself has been stable for several Android release cycles: Google's September 2026 Android Feature Drop shipped new features like Find Hub tracking and Motion Assist but left Data Saver untouched.

If you prefer to watch the steps, this 2026 walkthrough covers the current Settings layout:

Samsung Galaxy: Data Saver and the new Adaptive Data Saver

Samsung puts the same feature under its own menu: Settings → Connections → Data usage → Data saver. The whitelist lives one tap further down as Allowed to use data while Data saver is on.

New for 2026, Samsung's One UI 8.5 update adds an Adaptive Data Saver designed to cut background downloads automatically rather than relying on a single on/off switch. As Sammy Fans reported, the stable rollout began with the Galaxy S25 series and Samsung's foldables, with the wider global wave starting May 11, 2026 and continuing device by device through the year — Droid-Life's September 2026 update tracker shows the 8.5 branch still landing on more models. On supported phones you'll find it in Settings → Connections → Data usage, alongside the standard Data saver toggle.

One caveat worth knowing: a thread on Samsung's own community forum documents Galaxy S users whose data consumption went up after installing One UI 8.5. If that sounds like your phone, open Data usage, check the per-app breakdown for a specific culprit, toggle Adaptive Data Saver off for a few days to compare, and report the spike through the Samsung Members app so it's logged.

How to turn on Low Data Mode on iPhone

Apple's version is called Low Data Mode, and Apple's support document confirms it works per connection:

For mobile data: Settings → Cellular → Cellular Data Options → Data Mode → Low Data Mode. On a dual-SIM iPhone, set it separately for each line.
For a specific Wi-Fi network: Settings → Wi-Fi, tap the ⓘ next to the network, then toggle Low Data Mode. The iPhone remembers this per network.

Low Data Mode pauses background app refresh, automatic downloads and backups, and drops streaming quality in apps that respect it. One behavior catches people out: as an August 2026 iPhone guide from Jetpac notes, iOS applies Low Data Mode restrictions automatically when you connect to someone else's personal hotspot. If your streaming quality suddenly dropped while tethered to a friend's phone and you changed nothing yourself, that's why.

Android Data Saver vs iPhone Low Data Mode vs Samsung Adaptive Data Saver

Most guides cover one platform. Since many households mix devices, here's the side-by-side view:

	Android Data Saver	iPhone Low Data Mode	Samsung Adaptive Data Saver (One UI 8.5)
Where to enable	Settings → Network & internet → Data Saver	Settings → Cellular → Cellular Data Options → Data Mode	Settings → Connections → Data usage (supported 8.5 devices)
Main job	Blocks background data for all apps	Cuts background refresh, auto-downloads and stream quality	Targets background downloads automatically
Per-app exceptions	Yes — "Unrestricted data" list	No manual app whitelist; set per line or per Wi-Fi network	Handled by the standard Data saver's allowed-apps list
Works on Wi-Fi	Only on networks set as metered	Yes, per network under Wi-Fi → ⓘ	Primarily aimed at mobile data
Quirk to know	Unchanged for several Android release cycles	Activates itself on other people's hotspots	Some users report higher data use after the 8.5 update

Which apps should you whitelist?

Whitelist the apps whose delay would actually cost you something: your messaging app, email, maps/navigation, and any work tools with time-sensitive notifications. Leave streaming, social media and cloud photo backup restricted — those are usually the heaviest background consumers and can all wait for Wi-Fi.

Keep in mind that whitelisting only governs background data. Anything on screen uses data at full rate regardless, which is why running two apps side by side burns through an allowance roughly twice as fast — our explainer on how tablets split screen apps on Android, iPad and Samsung shows what stays active where. Also note that some apps run their own in-app data saver independent of the system toggle: Spotify, YouTube and several social apps have separate switches inside their own settings menus.

When Data Saver is actually worth using

Multiple 2026 guides still call Data Saver critical for anyone near their monthly cap — Yahoo Tech's walkthrough is one example — and the strongest cases are roaming abroad, metered hotspot connections, rural coverage where every megabyte crawls, and the final week of a billing cycle when you're already over budget. The counter-argument exists too: Google retired Chrome's dedicated Lite Mode back in 2022, reasoning that cheaper data plans made it unnecessary — which is why searching "Chrome data saver" today leads nowhere. Chrome now simply respects the system-level toggle.

In practice, the retirement of Lite Mode hasn't made data saving obsolete; it has moved it into the operating system. If you travel even occasionally, enabling Data Saver belongs on your travel tech packing list right next to the power bank and the eSIM — roaming background sync is the fastest way to turn a cheap travel plan into an expensive bill.

Troubleshooting: when Data Saver misbehaves

Why is Data Saver greyed out or stuck on?

Three common causes. On iPhone, remember the toggle is per line and per Wi-Fi network — you may be turning it off for one connection while it stays on for another, which is exactly the complaint in this Spotify community thread about 4G. A work or school device-management profile can also lock the setting. And check inside the affected app itself: as another Spotify user discovered, an in-app data saver keeps restricting that app no matter what the system toggle says.

Why did Data Saver stop working after an update?

Major OS updates sometimes reset network-related toggles or migrate settings menus — a complaint that goes back years on Samsung's forums and resurfaced with One UI 8.5. After any big update, re-check that Data Saver is actually still on, confirm your whitelist survived, and watch the per-app usage breakdown for a week before assuming the feature itself is broken.

Does Data Saver drain more battery than it saves?

This question circulates on Samsung's forums, and there's no solid evidence behind it. Blocking background sync means fewer radios waking up, which if anything nudges battery use down. A phone that feels worse on battery after enabling Data Saver is usually dealing with apps retrying failed syncs aggressively — whitelisting the worst offender typically settles it.

Frequently asked questions

What's the difference between Android's Data Saver and iPhone's Low Data Mode?
Both restrict background activity, but Android gives you a manual per-app whitelist, while iPhone applies Low Data Mode per line or per Wi-Fi network with no app exceptions. The comparison table above breaks down all three platform versions.

Why are images fuzzy and some sites slow with Data Saver on?
Some apps and browsers detect the restricted connection and serve compressed media on purpose. It's the feature working as designed — open the app fully or connect to Wi-Fi for full quality.

Does Data Saver work on Wi-Fi?
On Android it applies to a Wi-Fi network only if you mark that network as metered. On iPhone, Low Data Mode has a dedicated per-network Wi-Fi toggle under Settings → Wi-Fi → ⓘ.

Will I still receive calls and texts?
Yes. Voice calls and standard SMS don't use mobile data, so Data Saver leaves them alone. Rich messaging and MMS rely on data and may be delayed until you open the app or whitelist it.

Chester Takau — AIGadgeTech

Chester Takau is an independent tech reviewer who synthesises professional testing data with real user experience to cut through marketing claims.

Sources

Updated September 2026 to reflect the One UI 8.5 Adaptive Data Saver rollout and the September 2026 Android Feature Drop.

Transparency note: This article was researched and written by Chester Takau with AI assistance for research gathering and drafting. All recommendations reflect the author's own editorial judgment.