Set each child's phone up before you leave: give it its own prepaid data plan or keep it on Wi-Fi only, turn off data roaming on its home line, block in-app purchases and switch on data saving. A prepaid eSIM per phone gives each a fixed cost; one eSIM QR code installs on one device only.
Why do children's phones cause bill surprises?
Teenagers use their phones exactly as they do at home: video, games, music, group chats full of clips. That is fine on home Wi-Fi and expensive on pay-as-you-go roaming. Three things make it worse on a family trip:
- The alerts go to the account holder, often a parent's email, not to the child using the data.
- Roaming may be on by default on the child's line, and the phone does not ask before using it.
- In-app purchases are a second bill. Not roaming, but a holiday with a lot of screen time can mean a lot of small purchases.
What are the options for each phone?
| Option | Cost | Good for | Watch out for |
|---|---|---|---|
| Wi-Fi only | Nothing extra | Younger children who stay with you | No maps or messages when they are away from Wi-Fi |
| Prepaid eSIM for that phone | One fixed price per phone | Teenagers with some independence | Phone must support eSIM and be unlocked |
| Your hotspot | Uses your data | Short outings together | Only works near you; your plan must allow hotspot |
| Carrier roaming pass | Per day, per line | Short trips, locked phones | Daily charges multiply by days and by phones |
The prepaid option has a useful property for parents: the price is the ceiling. When the plan's data runs out, it stops, and there is no bill afterwards, as long as the phone's home line cannot use roaming data in the background.
What does it cost for a family?
A family of four on a nine-day trip: two adults, two teenagers. Every price is an invented example.
- Day pass per phone ($10 a day, example)$10.00
- Daysx 9
- Phonesx 4
- Roaming total$360.00
- Adult plans: 2 x $22 (example)$44.00
- Teen plans: 2 x $15 (example)$30.00
- Group discount (if the store offers one)check
- eSIM total before any discount$74.00
TripoSIM's Family & Group Pack page, for example, says groups of four or more people get 10% off, with each member receiving their own eSIM QR code. Check the page for current terms; for the arithmetic of group offers in general, see our guide to group eSIM savings for four travellers.
How do you set up a child's iPhone?
- Data roaming off on the home line: Settings > Mobile Data (Cellular) > the home line > Data Roaming off.
- Install the travel eSIM on Wi-Fi at home, make it the mobile data line, and switch it off until you land. See when validity starts.
- Block in-app purchases: Settings > Screen Time > Content & Privacy Restrictions > App Store Purchases (iTunes & App Store Purchases on older versions) > In-app Purchases > Don't Allow. With Family Sharing, you can also use Ask to Buy.
- Turn off mobile data for heavy apps: in Settings > Mobile Data, switch off video and game apps that do not need it.
- Low Data Mode on the travel line, and photo backup on Wi-Fi only.
How do you set up a child's Android phone?
- Roaming off on the home SIM: Pixel: Settings > Network & internet > SIMs > the home SIM > Roaming off. Samsung: Settings > Connections > Mobile networks > Data roaming off.
- Travel eSIM as the data line, installed on Wi-Fi and switched off until arrival.
- Purchases: in the Play Store, require authentication for purchases; with Google Family Link, purchases and downloads can need a parent's approval.
- Data Saver on, and a data warning or limit on the travel line in its data usage settings.
What house rules keep the bill fixed?
- Video and games on Wi-Fi. Download films and playlists before you leave.
- Mobile data for maps, messages and meeting up. That is what the plan is for.
- Tell a parent before buying anything, including a top-up.
- Do not touch the SIM settings. If something stops working, ask first.
- Check usage together after the first two days, so a heavy start can be corrected.
What about hand-me-down and older phones?
Older phones may not support eSIM, and phones bought through a carrier may still be locked to it. Check both weeks before the trip: the phone's settings will show an option to add an eSIM if it supports one, and the carrier can tell you about lock status. If the phone cannot take an eSIM, the table above still gives you Wi-Fi only, your hotspot or a roaming pass.
What if a child's phone is lost or stolen abroad?
A lost phone is a cost problem as well as a safety one. Three steps limit it:
- Call the home carrier to suspend the home SIM, so no one can run up calls, texts or roaming on it.
- Lock or erase the phone with Find My on an iPhone, or Google's Find Hub (previously Find My Device) on Android.
- Plan for data on a replacement. An eSIM installed on the lost phone generally cannot be moved to another device, so a replacement phone usually needs a new plan. Ask the eSIM seller what it can do, but budget as if you will buy again.
- Home line data roaming off
The phone cannot run up roaming data.
- A fixed data option chosen
Prepaid eSIM, hotspot or Wi-Fi only.
- In-app purchases blocked or approved by a parent
The second bill is closed too.
- Alerts reach a parent
Or the line is prepaid, so alerts matter less.
- House rules agreed
Video on Wi-Fi, ask before buying.
Frequently asked questions
Can my children use my phone's data instead of their own plans?
Yes, through your phone's personal hotspot, if your plan allows hotspot use. It uses your data allowance, so budget for it, and it only works while they are near you. For teenagers who go off on their own, a plan per phone is usually simpler.
Does one eSIM work on two phones?
No. An eSIM QR code generally installs once on one device. TripoSIM's FAQ says each QR code can only be used once on one device, so each phone in the family needs its own plan.
What if my child's phone does not support eSIM?
Then a travel eSIM will not work on it. Your options are Wi-Fi only, your hotspot, a carrier roaming pass on its existing SIM, or a local physical SIM if the phone is unlocked. Check eSIM support and lock status well before the trip.
Can I limit how much data a child's phone uses?
On Android you can set a data limit on the line, and Google Family Link gives parents controls over apps and purchases. On iPhone, Screen Time controls purchases and apps, and you can turn mobile data off per app. A prepaid plan is itself a limit: when it runs out, it stops.
Sources and notes
- Apple: use Screen Time to manage your child's iPhone
- Google Family Link help
- TripoSIM Family & Group Pack
Prices in this article are invented examples for the arithmetic, not offers. TripoSIM facts are quoted from its public pages on the date shown and can change; the TripoSIM checkout and policy pages are authoritative. See how we compare and our editorial policy.