Buying data for a family trip

Points for children and older travellers

• A child's phone should have its own data so they can be reached if separated
• Older travellers often use very little; the smallest plan is usually enough
• Install and test every phone at home, not at the airport

What this planner compares, and what it compares it against

This page puts two options side by side: one plan for each traveller, or one plan on an adult's phone shared out over a hotspot. You supply three things — how many people, how much data you expect each of them to use per day, and how many days the trip runs. Everything after that is multiplication and addition. Nothing here connects to a supplier, and nothing measures what any phone in your household is actually doing.

The limitation is simple but worth stating: the output is not a measurement, it is a mirror of the assumptions you fed it. Guess the per-person figure high and it will tell you to buy more than you need. Guess low and sharing will look better than it really is. The tool has no way of knowing whether your child watches video for the whole train journey.

Use it as a comparison device rather than a forecast. Run it once with a frugal assumption and once with a heavy one. If both runs point the same way, your decision is not sensitive to the guess. If they point in opposite directions, that is the signal to go and find a real number from a phone instead of guessing again.

A family is not a group of friends, and that changes the answer

A group of friends usually moves as one mass, agrees on where to go next, and anyone who peels off can find their own way back. Families do not work like that. Somebody tires first, somebody is hungry first, somebody needs an afternoon sleep and somebody wants to keep going. By three o'clock on the first day, most families have quietly split into two groups.

The moment they split, sharing stops working. A hotspot reaches a few metres. Whoever walks away from the host phone goes offline at exactly the point you most want to reach them. That cost never appears in a price comparison, and it is why plenty of families choose to pay more with their eyes open.

So the planner does not tell you which option is right. It tells you what the gap between them costs. Whether that gap is worth the peace of mind is a question only you can answer, because it depends on how old the children are, how familiar the city is, and how often the itinerary pulls you apart.

The per-person figure should come from a real phone

The field that distorts the result most is data per person per day. Most people fill it in by feel, and the feel is wrong in different directions for different members of the household. Parents overestimate themselves because they notice how often they pick the phone up, and underestimate their children because they cannot see what is on the screen.

The fix takes under ten minutes and can be done before you leave. Every phone keeps its own data statistics. The menu sits in a different place on each manufacturer's build and shifts between operating-system versions, but it is generally under something to do with the network or mobile data. What you want is the mobile figure for a month, not a total that folds Wi-Fi in with it.

A month at home is not what a trip looks like, because at home there is Wi-Fi for most of the day. But it beats a guess, and more usefully it establishes an order: it shows who in the household is heavy and who is light, which is exactly the question this page is asking.

Sharing from one phone: what the price does not tell you

Buying once and sharing always looks like value on the numbers: you pay for one plan and everybody uses it. Three costs sit outside that price. The first is battery. A phone running a hotspot works considerably harder than usual, and it is normally the same phone being used for the map. By early evening it is the first to go flat.

The second is range. A hotspot covers a few metres and does not travel well through walls; in a hotel with rooms on different floors it barely functions. The third is responsibility. The host phone becomes the family's infrastructure, and whoever carries it can no longer go anywhere alone, because the moment they walk off everyone else drops.

If the result shows a small gap, separate plans usually win once those three costs are added in. If the gap is big enough to move the trip's budget, sharing is a workable answer — provided you agree in advance which phone is the host, who carries the power bank, and what happens on the days you split up.

Reading the result and turning it into a decision

The output compares two bundles: the sum of individual plans, and one plan large enough for everybody's usage combined. What matters is not either total but the gap between them, because the gap is what you are actually buying — the amount you pay so that everyone can be online without walking in formation.

1. 1Count phones that need data, not family membersA young child with no handset does not count. Anyone carrying both a phone and a tablet who intends to use both away from the hotel counts as two.
2. 2Enter the per-person figure from the phone statistics, rounded up a littleA trip uses more than daily life because the Wi-Fi safety net is gone. A small margin beats an exact fit, since topping up mid-trip is more hassle than buying a little extra at the start.
3. 3Run it twice, once frugal and once heavyIf both runs agree, decide and move on. If they disagree, the answer is riding on your guess, and it is worth going back for a real number.
4. 4Put the gap to a single questionAsk whether you would pay that gap so your child and your partner can be reached at any moment. If yes, buy separately. If no, plan the sharing properly instead.
5. 5Check every handset supports eSIM before you payOlder handsets, and some models sold in particular markets, cannot take one. Check each phone first: the whole plan collapses if one of them turns out to be ineligible.

Check whether each handset supports eSIM

Children on the trip: data is how you find each other

The reason a child's phone should carry its own data is not entertainment, it is contact. In a crowded station or a mall with several floors, a child who is separated but online can message, share a location or take a call through an app. A child depending on a parent's hotspot goes offline at precisely the moment they walk out of range.

If the child's handset is too old for an eSIM, keep it on the hotspot and add a method that does not need data at all: agree a specific meeting point before entering each place, and put the hotel name and address in the local language into their pocket. It is an old technique that still works when the phone cannot help.

With an older child who has their own phone, have the data conversation before departure rather than when it is nearly gone. Tell them the size of the plan, how many days it covers, and that high-resolution video costs many times what messaging does. Setting video apps to a lower quality for the trip helps far more than a ban.

Older travellers: the smallest plan is usually enough

Retired travellers with the family usually use less than everyone assumes, because their use is messaging and photos rather than navigation or streaming. The smallest plan is often enough, and buying them a small one separately frequently costs less than upsizing the family's shared plan to carry another person.

The effort is better spent on installation than on sizing. Do it at home with someone familiar sitting alongside, and confirm with your own eyes that the new line works before departure. Fixing it at the airport, with the traveller flustered and the terminal loud, is the worst version of the same job.

It also helps to write down two lines of first aid: if the internet stops, toggle airplane mode once; if that does not fix it, message someone in the group. Two steps that get remembered are worth more than a long manual nobody opens.

Install every phone at home, not at the airport

Installing a profile needs internet, which feels backwards for something bought to provide internet, but it is an unavoidable technical fact: the handset downloads the profile from a server. Doing it at home on Wi-Fi is the right order. Switching the line on can wait until you arrive.

For a family, do it as one sitting. Take an evening, install each phone in turn, and label each line clearly with the trip it belongs to. A screen full of unnamed lines is how people end up using the wrong one, especially on a handset carrying both a home SIM and an eSIM.

• Install every profile at home, on Wi-Fi
• Name each line so it is obvious which one belongs to which trip
• Turn roaming data off on every home SIM before leaving
• Confirm the children's phones share their location with a parent
• Keep every order confirmation together in one place
• Charge the power bank and put it in the cabin bag
• Test the hotspot once at home if you intend to share

Divide the jobs in advance so nobody improvises

Families that travel smoothly are rarely more technical than anyone else; they have simply divided the jobs. One person owns the connectivity for all the phones, one keeps the paperwork and confirmations, one is responsible for the power bank. When something goes wrong, everyone knows who to ask instead of all opening their phones at once.

Bank OTPs and the number you still need

The thing families forget most often is the bank OTP, which arrives by SMS on the original number. Turn the home SIM off entirely to avoid roaming charges and the code never arrives — a fact you discover at the checkout. The safer setting is to disable roaming data while leaving the line able to receive SMS, which is normally free to receive.

Terms and charges differ by whichever operator issued your number. We do not know every operator's rules and should not guess on their behalf. Ask yours directly how receiving SMS abroad is billed, then set the phone to match that answer rather than what you remember from a previous trip.

If the family shares a bank account, or one person pays for everything, make sure that person's handset is definitely still receiving SMS — and that it is not also the phone most likely to die from running a hotspot. It is another reason the host phone and the paying phone should not be the same device.

When one person runs out first

With separate plans, data does not flow between them. If a child empties theirs on day three, a parent's plan does not automatically help. Two things work immediately: let a phone with data left run a hotspot for a while, or buy that phone an additional plan — which needs internet to purchase and install, so do it at the hotel on Wi-Fi.

This is why it is worth agreeing on day one that anyone running low says so immediately rather than after the fact. A day's notice turns a problem into an errand, because it can be handled back at the hotel instead of on a pavement while everyone is trying to leave.

With a shared plan the failure mode inverts: nobody runs out individually, everybody runs out at once. The upside is a single figure to track. The downside is that when it goes, the whole family goes with it, so set a warning on the host phone and read the total each night rather than only when things feel slow.

Plan first, then choose the plan

The order that wastes the least money is structure first, catalogue second. Once you know how many plans you are buying, for whom, and how many days each has to cover, browsing gets quick — you are matching a specification instead of scrolling and letting prices change your mind.

If the trip crosses borders, settle coverage before you settle quantity, because it can change the whole structure. A family visiting two neighbouring countries may want one regional plan each rather than two single-country plans each, which cuts both the number of installs and the number of things everyone has to be told.

Browse plans by destination

Getting help if something goes wrong on the trip

There are three ways to reach us: LINE at https://lin.ee/skDPoNx (@esimonline), email at esimonline.asia@gmail.com, and phone at 089-942-0818 and 088-521-6848. We take support around the clock, every day. For a family trip, it still argues for installing and testing every handset before you fly instead of relying on a reply on your first night away.

When you write, put it all in one message: handset model, which country you are in, what is happening, and the order number for that plan. On a family order with several plans, say which handset has the problem — often only one is misconfigured while the rest are fine. That detail is usually the difference between one reply and four.

Open the contact page