Last updated: August 22, 2026
Have you ever landed somewhere new, used little more than maps and messaging for a few days, and then noticed nearly half your data was already gone? The easy assumption is that you bought too small a plan — but often the real cause is somewhere else entirely. Here's the short version: most of the data that disappears faster than expected abroad is spent on traffic you never asked for — photo backups, automatic app updates, and background refresh. All of it can be reviewed in a few minutes before you leave, so this article covers how to switch each one off, plus how to tell which connections are worth keeping on.
- Automatic traffic is the main culprit
- Five settings to review before departure
- How to turn them off on iPhone and Android
- Some background traffic is worth keeping
- What to check if data drains fast on the ground
Why data disappears when you're "not using" your phone
Your phone keeps talking to the internet even when the screen is off. The photo app uploads the shots you just took, the app store checks for updates, and social and map apps pre-load content so they open quickly next time. At home you barely notice any of it, because you spend most of your day connected to Wi-Fi at home, at work, or on campus.
Travel changes that. Wi-Fi time drops sharply, so everything that used to run quietly over Wi-Fi now runs over your mobile connection instead. On top of that, you're taking far more photos and videos than usual, so there's simply more to sync. When people say "I haven't changed how I use my phone, but it's draining faster," these two shifts stacking up is usually why.
Exactly how much data that adds up to varies enormously with how much you shoot, at what quality, and which apps you use, so any single number would be misleading. Still, uploading even a handful of videos can make a noticeable dent. If you'd like the fuller picture — including the cost side — pair this with Using Your Phone Abroad As-Is: How Big Bills Happen and How to Avoid Them, which covers the connection itself, while this article covers what your apps do with it.
Five kinds of automatic traffic to review before you go
Here's the overview. You don't need to disable everything, but the first three are the ones most likely to bite you on a trip.
| Setting | What tends to happen abroad | What to do before you leave |
|---|---|---|
| Photo and video auto-backup | Every shot you take gets uploaded to the cloud — and you're shooting far more than usual | Turn off uploads over mobile data so backups run on Wi-Fi only |
| Automatic app updates and downloads | Updates kick in mid-trip and pull down a sizeable chunk in one go | Set automatic updates to Wi-Fi only |
| Video and music autoplay / offline downloads | Feeds that autoplay and high-quality streaming both consume data quickly | Turn off autoplay; download anything you want to watch over Wi-Fi before you go |
| Background app refresh | Apps you never opened keep trickling data all day | Narrow it down app by app and keep only what you need |
| Device and cloud backups | Depending on your settings, these can run over mobile data too | Confirm they're limited to Wi-Fi |
How to turn them off on iPhone
On iPhone, everything you need lives inside the Settings app. Working through it in this order makes it hard to miss anything.
- Photo syncing: Settings → Photos → Mobile Data (Cellular Data), and switch it off so uploads only run on Wi-Fi
- App updates: Settings → App Store → under Mobile Data, turn off automatic downloads and app updates
- Background refresh: Settings → General → Background App Refresh, and set it to Wi-Fi (or off entirely)
- Per-app data access: Settings → Mobile Data (Cellular) lists every app with its usage and an on/off switch. Turning off apps you won't need during the trip is good insurance
- Reset your statistics: at the bottom of that same screen, reset the usage stats so it's easy to track what you actually use once you arrive
Menu names and their order shift between iOS versions. If you can't find a match, type "mobile," "cellular," or "background" into the search bar at the top of Settings and you'll land close to the right place.
How to turn them off on Android
The thinking is the same on Android: push everything toward "don't sync over mobile data."
- Photo backup: Google Photos → your profile icon → Backup settings, and turn off mobile data use
- App updates: Google Play Store → Settings → Network preferences → Auto-update apps, and choose "Over Wi-Fi only"
- Data Saver: Settings → Network & internet → Data Saver. Switching it on restricts background data across most apps in one move
- Per-app control: Settings → Apps → the app → Mobile data & Wi-Fi, and turn background data off individually
- Usage warnings: if your phone supports data limits and warnings, setting one before you travel makes overuse easy to spot
Menu names vary by manufacturer and model (you may see "Connections" or "Data usage" instead). If you can't find it, search Settings for "data usage."
Airplane mode stops traffic while it's on, but everything that queued up can resume all at once the moment you switch it off or join Wi-Fi. If you want to keep data use down throughout a trip, don't rely on airplane mode alone — changing the sync and update settings themselves to Wi-Fi only gives you a far more predictable result.
Should you turn everything off? Traffic worth keeping
Honestly, it splits into two groups: people who are better off disabling nearly everything, and people who should leave a few things running. See which one sounds more like you.
You can turn off nearly everything if…
- You're travelling for a few days to a week and chose a smaller data plan
- You're happy to upload all your photos once you're back on home Wi-Fi
- Your trip mostly runs on maps, translation, and messaging apps
Leave some of it on if…
- You'll be checking work email or cloud files while away (keep background refresh on for those apps)
- You share your location with family, or want to stay closely in touch
- You're studying abroad or staying long-term and rely on apps from your school or housing provider for local updates
Cutting background data for your messaging apps in particular can mean notifications arrive late, or not until you open the app. A good rule of thumb: keep the apps you actually communicate through, and work down from the heaviest consumers — video, photos, app stores — first. Follow that order and you'll save data without missing anything important.
Does any of this change when you use an eSIM?
Everything above applies just the same with an eSIM. An eSIM changes which network your phone connects through; how much your apps send and receive is still decided by your device settings. If anything, tidying up before departure matters more, because it's what lets you get full value out of the data you bought.
The other thing worth sorting out is which line handles your mobile data. Once you arrive, switch mobile data over to the eSIM. How you treat your home-country line — whether to leave data roaming on or off, for instance — depends on your plan and your device, so it's worth reading Using Your Phone Abroad As-Is: How Big Bills Happen and How to Avoid Them and settling the line-level settings before you fly. That removes any worry about paying for two connections at once.
Bloomy eSIM is data-only: there's no phone number attached, so voice calls and incoming SMS aren't available. App-based calling over data — WhatsApp, Messenger, FaceTime and similar — works as normal. If you expect to need SMS verification codes from your bank or other services, plan ahead for how you'll keep your home-country number reachable, or arrange a separate option that includes a number. Data plans are also subject to a fair usage policy, so it's worth reading the plan details at the point of purchase.
Setup is straightforward: tap the activation link you receive after purchase, follow the on-screen prompts to add the plan, and switch the line on once you land. To see the steps in advance, visit the setup guide; to check whether your phone supports eSIM, see the compatible devices page. If you'd rather pick a destination and data amount first, the eSIM comparison page lets you filter by country, data allowance, and number of days.
What to check when data drains fast on the ground
Forgot to change something before you left? You can still fix it on the spot. Before you rush to buy more data, run through this list.
- Look at the breakdown: on iPhone, Settings → Mobile Data (Cellular); on Android, Settings → Network & internet → Data usage. See which apps are using the most
- Start with the biggest offenders: if an app is using far more than you'd expect, turn off its background data
- Stop photo syncing: the more you've been shooting that day, the bigger the difference this makes
- Lower your quality settings: check streaming playback quality and video-call settings
- Still not resolved? The connection itself may be unstable. For connectivity checks, see the troubleshooting page; for questions before or after purchase, the FAQ covers the common ones
Keep in mind that speed and stability vary with the local network, your device, your location, and how busy the network is at that hour. If things feel slow while you're on the move or in a crowded place, it may be temporary congestion rather than anything in your settings.
In short: a few minutes before departure, one less thing to worry about
When data runs out quickly abroad, it's usually less about how you're using your phone and more about what it's doing on its own. Switching just three things — photo backup, automatic app updates, and background refresh — to Wi-Fi only makes a real, noticeable difference. Keep the apps you communicate with, and work down from whatever consumes the most: follow that order and you won't end up missing messages.
Once your settings are sorted, all that's left is arranging the right amount of data for where you're going. The eSIM comparison page lets you search by country, data allowance, and number of days, so you can pick a plan that fits your trip length and how you actually use your phone.
This article reflects general information as of August 2026. The names and locations of settings differ by device, OS version, and manufacturer. Plan contents, pricing, and country coverage are subject to change — please confirm the current details on the comparison page before purchase.
