Last updated: August 5, 2026 (date the information here was reviewed)
Once you've installed a travel eSIM, it's natural to wonder whether you can just leave your regular home-country line switched on. On a dual-SIM screen, your home line and your travel eSIM sit side by side, and it isn't always obvious which one should be doing what. The short answer: if you don't plan to use your home line while you're away, turning the line itself off ("Turn On This Line" off / "Use SIM" off) — not just disabling data roaming — is the most reliable way to cut down on unintended connections. Below are the exact steps for iPhone and Android, plus the things worth checking before you flip that switch.
- Why switching the whole line off beats roaming-off alone
- Where the setting lives on iPhone and Android
- Which messages stop reaching you
- How to set things up if you want to keep your number active
- What to check if charges still appear
Turning off data roaming is a good start — but only a start
Disabling data roaming is a genuinely useful setting, but with it alone your home line stays active and on standby. An active line can still receive calls to your number, receive SMS, and run certain operator services. And settings have a way of quietly reverting — after a restart, a software update, or a bit of tapping around in the settings app.
If you have no plans to use your home line during the trip, switching the line off entirely leaves you with a much clearer picture of what's active, and saves you from re-checking the settings screen every other day. With only the travel eSIM enabled, all mobile data goes through it.
The three states your home line can be in
"Off" can mean several different things depending on which switch you flip. Seeing all three side by side makes the choice easier.
| State of your home line | Mobile data | Calls & SMS to your number | When it makes sense abroad |
|---|---|---|---|
| Line on + data roaming on | Yes (charged according to your carrier's plan terms) | You receive them | When you're deliberately using your home carrier's international plan |
| Line on + data roaming off | Generally none | You receive them (charges for calls/SMS depend on your carrier's terms) | When you want to stay reachable on your number but use the eSIM for data |
| Line off ("Use SIM" disabled) | None | You don't receive them | When you've decided not to use your home line at all during the trip |
Rates and conditions vary by operator and plan. Check your mobile carrier at home for their current official terms before you travel (information reviewed August 2026).
How to turn off your home line on iPhone
Install your travel eSIM first, then do this — that way you're never left without a working connection mid-step. The general flow:
- Open Settings → Cellular (or Mobile Data).
- From the list of lines, tap your home line (it will show your carrier's name or whatever label you gave it).
- Turn off Turn On This Line.
- Go back to the list and confirm that Cellular Data is set to your travel eSIM.
- Select the travel eSIM and check that Data Roaming matches the instructions that came with your plan.
It's also worth turning off Allow Cellular Data Switching, which stops the phone from automatically falling back to the other line when one has weak coverage. Menu names and their exact placement shift a little between iOS versions.
How to turn off your home line on Android
Labels differ by manufacturer and Android version, but the logic is identical.
- Open Settings → Network & internet → SIMs (or Mobile network).
- Select your home line and turn off Use SIM.
- Confirm that mobile data is assigned to your travel eSIM.
- Check the roaming setting on the travel eSIM against the instructions you received at purchase.
Some manufacturers call this screen Dual SIM, SIM card manager, or something similar. If you can't find it, type "SIM" into the search box at the top of the Settings app.
Three things to check before you switch it off
Turning the line off means anything tied to your phone number stops reaching you. A single check before departure is usually enough to avoid an unpleasant surprise.
- Incoming calls and SMS to your number: if your workplace, school, or family is likely to reach you on your home-country number, one option is to switch the line back on only for those windows.
- SMS verification codes: if your bank back home, your brokerage, or other services send one-time codes by SMS, not receiving them can stall a transaction entirely. Check each service's official guidance before you travel to see whether you can switch to an authenticator app or another method. Policies differ from service to service, so it's not something we can generalize about here.
- Voicemail, call forwarding, and similar services: behavior depends on your specific contract. If you rely on these, look up the current terms on your operator's official pages.
If you do need to stay reachable, the middle option — line on, data roaming off — is a reasonable compromise. In that case, confirm in advance what your operator charges for incoming calls and SMS while abroad.
Who this approach suits — and who it doesn't
Neither option is better in the abstract. It comes down to whether you'll need your home-country number while you're away.
Switching the line off entirely works well if you:
- Are on a short trip and can stay in touch through apps like WhatsApp
- Would rather not fiddle with settings and want an unambiguous on/off state
- Have previously been caught out by your home line quietly using data in the background
Keeping the line on makes more sense if you:
- May need to take calls to your number for work or family reasons
- Have transactions planned during the trip that require SMS verification
- Are on a long stay or extended trip and want to keep your home number active while using the eSIM for data
If charges appear even after you've turned the line off
When the settings look right but charges show up anyway, the cause often lies outside the settings screen. Common explanations: a short burst of data before departure or right after landing, a different line being used among several on the device, or a billing cycle that makes usage dates look misaligned.
We've laid out how to narrow down the cause, step by step, in Charged even with roaming off? Causes and how to check. If a charge doesn't look familiar, work through that list from the top. To verify whether your device is generating traffic at all, Troubleshooting: no connection or unexpected behavior may also help.
How this works with a Bloomy eSIM
With Bloomy, you add the eSIM with a single tap on the setup link you receive. The clearest sequence is: install it over Wi-Fi before you leave, switch the travel eSIM's line on once you land, then turn off your home line using the steps above. The full walkthrough is in our setup guide.
Bloomy eSIMs are data-only: there's no phone number, no SMS, and no voice calling over a mobile number. App-based calls that run over data — WhatsApp, Messenger, FaceTime and the like — work as usual. If you'll need a phone number or SMS at some point, either keep your home line active or arrange a separate number-based option. All plans are subject to a fair use policy, and real-world speed and stability vary with the local network, your device, and where you are.
To find a plan for where you're headed, the eSIM comparison page lets you filter by country or region, data allowance, and number of days; pricing is shown in USD, so check the current price at the time of purchase. Pre-purchase questions are covered in our FAQ, and if you'd like to read more on setup, see the eSIM guide.
In summary
If you won't be using your home-country number during your stay, switching that line off completely gives you the clearest, least surprising setup. If you do want calls and SMS to reach you, take the middle path — line on, data roaming off — and confirm the applicable charges beforehand. And if a charge still doesn't add up once your settings are in order, start by working through the diagnostic steps.
Note: this article describes the general flow as of August 2026. The names and positions of settings differ between devices and OS versions, and operator pricing and terms change over time. Always check your carrier's official guidance and what's actually displayed on your device before you travel.
