Twelve ways to save data while travelling

Set before you fly

• Disable automatic cloud backup for photos and video
• Disable app auto-updates on mobile data
• Turn off autoplay video in every social app
• Download the music and podcasts you plan to hear
• Download offline maps for every city on the itinerary

During the trip

• Keep the system data saver on
• Set streaming quality to low on mobile data
• Upload photos when back on accommodation Wi-Fi
• Disable background refresh for apps you do not need
• Message instead of video calling when it is not necessary
• Check your remaining data every couple of days
• Switch the eSIM line off when the accommodation Wi-Fi is good

Why these settings matter more than simply buying a bigger plan

Many people solve a data shortage by simply buying a bigger plan each time, without ever checking what is actually draining it so fast. Buying more headroom treats the symptom, not the cause, while the right settings take only a few minutes yet keep paying off for the whole trip.

The two lists above cover what to do before flying and during the trip. What follows explains why each one works, and where people commonly slip up without realising it.

What actually drains data without anyone noticing

Most of the data that vanishes without anyone noticing does not come from actively using an app, but from background processes: automatic cloud photo backup, quiet app updates, and autoplay video in a social feed that gets scrolled past without ever meaning to watch it.

These processes keep running in the background even after the screen is off. Without switching them off from the start, other data-saving habits during the day may barely make a dent.

The phone's data counter and the operator's own meter do not always match

The data counter shown on the phone is the operating system's own estimate, not a figure measured directly from the operator's side. The two numbers can differ slightly at all times, and in some cases enough to create the false impression that more data remains than actually does.

For a more reliable figure, checking through whatever channel the provider offers for tracking usage directly is more dependable than relying on the phone's own counter alone.

Checking data usage accurately during the trip

1. 1iOS: open the system counterGo to Settings > Cellular and scroll down to see each app's usage since the last reset period.
2. 2iOS: reset the counter to match the trip's start dateScroll to the bottom and reset the statistics, so the figures shown start counting from day one of the trip.
3. 3Android: open data usage settingsGo to Settings > Network & internet > Data usage, and set the date range to match the trip.
4. 4Cross-check against the provider's own channelIf the provider offers a separate way to check usage, compare the two figures periodically for a more reliable picture.

What the system's data saver mode actually does

The data saver mode built into the operating system works by restricting how freely background apps can use data. Whatever is open and in active use keeps working normally, while other apps not currently on screen have their background connections limited.

One side effect worth knowing is that some notifications may arrive a little later, since that app is no longer connecting in the background constantly. It is usually a fair trade for a trip where saving as much data as possible is the priority.

Extra care when sharing a hotspot with another device

A device connected through a hotspot, a laptop especially, tends to use data more heavily than a phone, because desktop operating systems commonly leave automatic updates and cloud file syncing switched on by default, settings that may not have been disabled the way they were on the phone.

Before sharing a hotspot with a laptop for work, its automatic updates and cloud file syncing are worth switching off too, not only the settings on the phone doing the sharing.

When it is not worth cutting data too far

Saving data is worthwhile, but a few situations make cutting it too far riskier than it is worth: turning off real-time maps while walking through an unfamiliar city at night, for instance, or refusing to spend data on a ride-hailing app once public transport has already stopped running for the day.

In situations tied to safety or finding the way back to accommodation, using whatever data is needed matters more than squeezing out maximum savings. It is worth deciding upfront that saving data should never come at the cost of safety.

App categories that quietly drain data, and the setting that helps

Common mistakes and how to fix them

If maximum saving still is not enough, what next

If every step above has been followed and data still runs out faster than expected, it may be time to step back and check whether the chosen plan actually matches real usage, rather than something more settings can fix.

The site's data calculator tool can estimate a more suitable allowance for the next trip faster than guessing, and if it is still unclear, the team can advise via LINE at https://lin.ee/skDPoNx or email at esimonline.asia@gmail.com.

If only three things can be done, start with these

• Disable automatic cloud backup for photos and video
• Turn off autoplay video in every social media app
• Download offline maps in advance while Wi-Fi is still available

Estimate data needs for the next trip

Browse plans by destination

Work out the daily budget first, then decide which settings to change

Most people start by switching things off according to whatever advice they read, without first knowing how much data they have per day. The result is either cutting so hard that the phone becomes annoying to use, or cutting so little that the allowance is gone by the middle of the trip. A better starting point: divide the total allowance by the number of days, then set aside about a quarter as a buffer for the days that do not go to plan. What is left is the real daily budget, and that number tells you how strict you need to be.

The other benefit of having a daily figure is that it turns mid-trip decisions from guesswork into arithmetic. When you can see what you have used since the morning, you know immediately whether tonight can include a video or whether it should wait for the hotel Wi-Fi — instead of carrying a vague unease around all day. That unease costs more enjoyment than the data costs money. If you are not yet sure what size to buy, estimate from your own habits rather than from somebody else's average.

Size your plan from your own habits with the data calculator

What is worth downloading before you fly, and what is not

Downloading in advance is the single most effective way to save data, because it moves the largest chunk of transfer onto home Wi-Fi where there is no per-gigabyte cost. People frequently download the wrong things, though. What earns its space is anything large that you know you will use: offline maps of the cities on the itinerary, offline language packs for translation, the playlists you actually listen to, and enough film or series to cover flights and long train legs. What does not earn its space is material downloaded just in case, which sits untouched and fills the storage until you cannot take photos on day three.

Offline maps are the best value item on that list, because navigation is something you use every day and precisely where the signal is worst — underground stations, narrow streets between tall buildings. Worth knowing: how much area you can save and how you select it differ by app and by version. Some let you draw a box on the map, others download by city or region. Do the download at home and then test it with the phone in airplane mode to confirm the map still works. That check takes a few minutes and saves a trip's worth of frustration.

Photo backup is the biggest single variable

Of everything that consumes data while the owner touches nothing, automatic photo backup comes first almost every time. The reason is plain: you shoot far more than usual on a trip, files from modern cameras are large, and a handful of short video clips is equivalent to hundreds of stills. Left running over mobile data, the backup can spend an entire day's budget on the morning's photos before you notice.

The answer is not to switch backup off entirely, which trades a data problem for the risk of losing the whole trip along with a mislaid phone. The balanced setting is Wi-Fi only, combined with the habit of making Wi-Fi part of getting back to the room each night: plug in, connect, let it work while you shower. If you have been shooting a lot of video, allow more time than that, and check the app has not stalled because the battery dropped or the screen went dark.

Navigating without eating the whole day's budget

Navigation is the thing you open most often on a trip and the thing people most fear will drain the plan. In truth it is nowhere near as heavy as video, but it stays open for long stretches and happens every single day, so the total mounts up beyond expectations. Only a few tactics really reduce it. Download an offline map of the whole city before you fly. Search for and start the route while still on the accommodation's Wi-Fi, so it is held on the device. And for a simple walk of a few blocks, a screenshot does the job.

Bear in mind that an offline map does not cover everything. Anything that changes minute to minute — traffic conditions, live public transport times, the most recent opening hours — generally needs a connection. Which features survive offline differs by app and by country, so test it in airplane mode before you travel. Far better to learn where you will still need data at home than while standing in an unfamiliar station.

Messaging and calls: which choices cost least

Among the ways of staying in touch, plain text costs almost nothing next to the alternatives. Voice costs more but is still modest. Video calling is clearly the heaviest, and the sharper the picture the heavier it gets. If the family wants to see your face, the workable middle path is voice while you are out and video once you are back at the accommodation on Wi-Fi. That keeps everyone reassured and the allowance intact.

The setting people overlook is automatic media download in chat apps. If a friends or family group is trading photos and clips all day, your phone pulls every one of them down whether or not you open it — data spent on nothing you asked for. Most chat apps let you set auto-download separately for mobile data and for Wi-Fi. Where that control lives varies by app and by version; look under whatever section deals with storage or data.

The browser settings people forget

Modern web pages are heavier than they look. A single news article may carry two or three self-starting video adverts, a stack of high-resolution images and scripts that keep loading as you scroll. Two things genuinely help. Use the browser's reader mode for long articles, since it strips out everything that is not the text. And turn off autoplaying video on web pages — most browsers offer the control, though its name and location differ between browsers and versions.

One habit worth adopting is opening a tab, reading it and closing it, rather than keeping fifteen or twenty parked. A dormant tab may reload itself when you switch back, and on pages whose content refreshes constantly it will pull the whole thing again. If you read a lot while travelling, saving articles for offline reading while on Wi-Fi works considerably better than reading them live over mobile data one page at a time.

Working from the road on a small plan

People who work while travelling face a different problem from ordinary tourists, because what drains the plan is not entertainment but the tools of the job. Auto-syncing cloud folders lead the field: a colleague uploads a large deck and your device pulls it down immediately while you are sitting on a train. The fix is to sync only the folders you actually need, or to pause syncing and resume it on Wi-Fi.

Online meetings deserve planning too. If you have to attend one from abroad, switch the camera off when you are not speaking and dial in by audio where the meeting allows it. Screen sharing is unusually expensive when you are the one sharing rather than watching, because the sending side is doing the uploading. If it cannot be avoided, schedule those meetings for hours when you are at the accommodation on Wi-Fi rather than in a café or in transit.

1. 1Pause cloud sync before you leaveOpen whichever file service you use and pause automatic sync, or narrow it to the folders this trip genuinely needs. How you do that differs between services and app versions.
2. 2Set mail to fetch headers, not attachmentsMost mail apps can be told not to download attachments automatically over mobile data. Set that, then fetch only the files you actually need to open.
3. 3Tell the team when you will be onlineAgreeing hours in advance cuts down on unscheduled calls, which are what force a mid-afternoon video call in a place with nothing but mobile data.
4. 4Put the files you need onto the device beforehandDownload the week's documents for offline use while on Wi-Fi, so nothing has to be pulled from the cloud at the moment you urgently need it.

Two devices, one plan: sharing without waste

Sharing the connection with another device is easy and often necessary, but it is where an allowance disappears fastest, because the joining device has no idea it is on mobile data. Laptop operating systems tend to treat any Wi-Fi connection as unmetered and start downloading system updates, syncing entire folders and running scheduled backups. All of that begins within minutes of connecting, and it is routinely enough to swallow several days of budget at once.

The settings that matter are on the joining device, not the one sharing. Every major operating system has a way to mark a connection as metered, which postpones updates and quietens background activity. What that option is called and where it sits differs by operating system and version. Beyond that, switch off cloud sync and automatic application updates before connecting, every time.

The days that break the budget, and how to plan around them

Data use is not spread evenly across a trip. Certain days are visibly heavier than the rest, and you can see them coming while you are still planning. Days spent moving between cities are the worst: timetables to check, a map open for the whole journey, a new place to contact on arrival, and long idle stretches on a bus or in a station that invite aimless scrolling. A day of heavy rain that keeps you indoors is another that runs well above the average.

Once you know which days are heavy, there are two ways to handle them. Prepare so that the day itself needs less: load the tickets, the maps and the viewing the night before. Or allocate that day a larger share when you do the arithmetic, rather than dividing evenly and being surprised later. Doing that means you are not rationing yourself on days that should be relaxed.

What Wi-Fi can replace, and what it cannot

Nearly every good data-saving plan leans on Wi-Fi as its backbone, but leaning too hard creates a different problem. Accommodation Wi-Fi suits big jobs done while stationary: photo backup, downloading media, updating apps, long video calls. What it cannot replace is everything that happens while you are moving — navigating, ordering a ride, scanning a code at a bus stop, reaching somebody when a plan changes at short notice — none of which happens where there is Wi-Fi to sit down on.

Public Wi-Fi carries a further caveat. An open network in a public place is better suited to general reading than to anything sensitive; if you need to sign in to a bank or fill in personal details, your own mobile connection is the more controllable option. Many public networks also require a form or a code sent by text before they will let you on, which can be unusable without a local number. That is why having your own connection still matters even when the plan is built around Wi-Fi.

A daily rhythm that keeps the plan alive to the last day

What causes people to run out early is rarely one heavy day; it is the absence of a routine. Travellers who get through a long trip without topping up tend to do the same things every day until they stop thinking about it. In the morning, before leaving, they load what the day requires. During the day they use what they need and keep video off mobile data. Back at the room, they plug in, join the Wi-Fi and let the backup and the updates run together. None of this takes willpower, because within a couple of days it is simply what you do.

• Morning: load the day's route, tickets and playlist while still on Wi-Fi
• Daytime: no video on mobile data, and autoplay off in any app with a feed
• Daytime: glance at the usage figure once in the afternoon so you know where you stand
• Evening: plug in and join the Wi-Fi the moment you are back, without waiting
• Evening: let the photo backup and app updates finish before you sleep
• Before bed: compare the remaining allowance with the remaining days and adjust tomorrow if needed

Want to know whether your device supports eSIM? Check here