Using your phone abroad exactly as you do at home can quietly run up a huge bill (the dreaded "bill shock"). In most cases the culprit is data roaming — your phone automatically latching onto a local carrier's network the moment you land. The short answer: switch "Data Roaming" OFF before you leave, and you'll avoid almost all surprise charges from unintended overseas usage. If you still want to get online while you're away, it's smarter to line up a separate option such as a travel eSIM or Wi-Fi. This guide walks through the settings and how to choose a connection, written so first-time travelers can follow along.
If you just want the setup steps, see our eSIM & Connectivity Setup Guide as well.
Why "just using your phone" abroad can lead to bill shock
A phone on your home plan will, wherever there's signal, automatically try to connect to a local carrier's network abroad. That's data roaming. Maps, social feeds refreshing in the background, photo and video backups, app updates — all of these keep sending and receiving data even when you're not touching the screen.
Roaming is usually priced separately from your normal home data, and depending on your plan and settings it can get expensive fast. Loading videos or moving large files can pile up usage in a very short time. The "how did my bill get this high?" moment is avoidable once you understand how the connection works and set things up in advance.
Roaming day-passes, daily caps, and covered countries vary by carrier and can change. For exact pricing, always check your own carrier's latest information.
First thing to do: turn Data Roaming OFF
The single most important setting for avoiding bill shock is turning Data Roaming OFF. It's best to do this before you travel, while you're still on familiar ground.
On iPhone
- Open the Settings app
- Tap Cellular (or Mobile Data)
- Tap Cellular Data Options
- Switch Data Roaming to OFF
On Android
- Open the Settings app
- Go to Network & internet → Mobile network (select your SIM)
- Switch Roaming (or Data Roaming) to OFF
Note: menu names and locations vary a little by device and OS version. If you can't find the option, type "roaming" into the search box inside Settings to locate it quickly.
Extra peace of mind: settings worth adding
On top of turning Data Roaming off, the following settings help shut down accidental usage even more reliably.
- Turn off Mobile Data entirely: useful if you don't want to use your home plan abroad at all.
- Airplane mode + Wi-Fi only: the go-to setup when you only want hotel or café Wi-Fi. Airplane mode stops the cellular connection, and you can then turn Wi-Fi back on manually.
- Turn off automatic app updates and auto-backup: stops large transfers from running in the background.
- Turn off autoplay in video apps: saves data.
With all of this in place, the risk that "my phone racks up expensive data on its own just by coming along" becomes very small.
But you still want internet abroad: how to choose a connection
Once roaming is off, your phone won't have mobile data on its own. If you want the internet for maps, translation, or staying in touch, you'll need to arrange a separate connection. Here's a neutral overview of the main options.
| Option | Best for | Watch out for |
|---|---|---|
| Free Wi-Fi only | People who barely use data | Limited locations; speed and security can be unreliable |
| Pocket Wi-Fi (rental) | Groups or multiple devices | You carry and return a device; mind the battery |
| Local SIM (swap) | Long stays where you also want a local number | May require swapping SIMs and an in-store sign-up |
| Travel eSIM | People who want an easy setup on their own phone | Needs an eSIM-capable device; most are data-only |
| Carrier roaming pass | People who don't want extra setup | Check daily price, caps, and covered countries first |
There's no single "right" answer — choose based on length of stay, number of people, budget, and how much data you'll use. If you'd rather keep your own phone and skip swapping a physical SIM, the eSIM comparison page makes it easy to search by destination, data amount, and number of days.
Why an eSIM is convenient, and how to choose one with Bloomy
An eSIM works by writing a travel data plan onto the digital SIM built into your phone. There's no physical SIM to swap, and in most cases you can buy it online before you leave and finish setup with a QR code. Typically, once you arrive you just activate the line.
To choose well, check these points:
- Does it cover your destination (country/region)?
- Data amount (smaller if you mainly use maps and social apps; larger if you'll watch video)
- Do the plan days match your stay?
- If you want to use plenty of data, an unlimited-style plan is also an option (see notes below)
- Is your device eSIM-compatible? (Check on the compatible devices page)
Bloomy is set up so that even first-timers can choose by country, data amount, and days, and after purchase you can check your remaining data and QR code from My Account. Plan details and pricing can change, so please confirm the latest information shown at the time of purchase.
Things to know up front (told to you straight)
Most travel eSIMs are data-only
Most travel eSIMs, Bloomy included, are data-only by design. As a rule they can't make or receive voice calls or SMS text messages tied to a phone number. If you need a phone number, SMS verification, or voice calling, look into another option as well (a plan that includes a number, or keeping your original line for those uses). In-app calls and chats on services like WhatsApp can still work wherever you have a working data connection. For more on phone numbers and SMS, our phone number & SMS explainer is a helpful reference.
How to read an "unlimited" plan
Unlimited plans are convenient, but it's important to know they often don't mean "no limits no matter how much you use." Speeds may be reduced after a certain amount of usage, a fair-use policy may apply, and whether tethering (sharing with other devices) is allowed can differ by plan. Real-world speeds also depend on the local network, area, and congestion. If you plan to use a lot over long periods, it's reassuring to check the unlimited plan terms in advance.
When to set up
With an eSIM, it's often safest to install it before you leave and activate it after you arrive. Activation timing varies by plan, though, so check the guidance provided at purchase.
If it won't connect or you're unsure
If you've set everything up but still can't get online, don't panic — check these in order.
- Is Airplane mode still ON? (Turning it on, waiting a few seconds, then off can sometimes help.)
- If you're using an eSIM, is it enabled as your active line (cellular plan)?
- Data Roaming may need to be ON for the travel eSIM (this is managed separately from the roaming OFF setting on your home line).
- Are you out of coverage or in a weak-signal area?
If that still doesn't fix it, our troubleshooting guide lays out the steps. When in doubt, reach out via Contact.
In summary: do just these before you go
Bill shock from using your phone abroad is easy to handle if you prepare in this order: (1) turn Data Roaming OFF → (2) turn Mobile Data off too if needed → (3) if you want internet, arrange an eSIM or Wi-Fi separately. Start by checking your settings, and if your destination is set, search the eSIM comparison page for a plan that fits your country, data amount, and days. For the basics of eSIMs overall, see our eSIM guide collection.
