No, you do not need to turn off your primary SIM when you activate a travel eSIM. Keep the home line active for calls, texts and bank codes, but assign mobile data to the travel eSIM and turn off Data Roaming on the home line so it cannot rack up charges on its own.
Your travel eSIM is ready, but the home number still receives bank codes, family calls and messages people already know how to reach. Do you really need to switch the primary SIM off before the plane lands?
Can you keep your home SIM and travel eSIM active together?
Yes, on compatible dual-SIM phones.
Apple’s current international eSIM setup explicitly allows a choice between using the travel eSIM alone or running it alongside the existing line. When both stay active, the travel eSIM can be assigned to handle mobile data while the home line stays reachable.
Google Pixel works the same way. The phone lets you assign separate SIMs to data, calls and text messages instead of forcing one line to do everything.
Key takeaways
- Dual-SIM phones can run a home line and a travel eSIM at the same time.
- Assign mobile data to the travel eSIM, not the home line.
- Keeping the home line active is a choice about the phone number, not a technical requirement.
Why keep the home SIM switched on?
The biggest reason is the original phone number.
You may still need it for:
- Bank verification codes. Many banks only send one-time codes to the number on file.
- Two-factor authentication by SMS. Some accounts will not accept a code sent to a new number mid-trip.
- Incoming calls from home. Family, work, deliveries.
- Messages sent to the number people already know. Switching numbers mid-trip means explaining the change to everyone who might contact you.
Turning the line off removes access to all of that until it is switched back on.
Why might you switch it off?
Predictability.
A home carrier can still charge for international roaming depending on its plan, the destination and how the line gets used. Apple’s own guidance warns that even when a travel eSIM is handling mobile data, keeping the home line active can still result in roaming fees.
If the home number serves no purpose during the trip, switching it off removes that uncertainty entirely. No line, no surprise charge tied to it.
Keep it on if
- You need SMS codes: banking, 2FA or any account tied to that number.
- People call the old number: family, work, deliveries expecting to reach you.
- You can control roaming settings: your phone lets you separate data from calls and texts per line.
Switch it off if
- The number serves no trip purpose: nothing time-sensitive is tied to it.
- You are unsure of the roaming plan: avoid the risk of accidental charges entirely.
- You want the simplest setup: one active line is easier to monitor than two.
If you keep it on, stop it carrying mobile data
Select the travel eSIM as the phone’s mobile-data line first.
On iPhone, Data Roaming can be controlled separately for each active SIM inside the mobile-data settings. Google Pixel similarly lets you set one SIM as the default data line while the other stays voice-and-text only.
Also check automatic cellular-data switching. If the whole point of the travel eSIM is to avoid home-carrier data roaming, you do not want the phone quietly falling back to the home line the moment signal on the travel eSIM dips.
Can receiving an SMS still cost money?
That depends on the home carrier and its roaming plan. Do not assume every call, text or voicemail is free simply because mobile data is switched off.
Check the carrier’s roaming conditions before departure if keeping the home line active matters to you.
Can you switch the home SIM off temporarily?
Yes. You do not need to delete it.
Both phone platforms and eSIM providers support disabling an active line without removing it. Saily, for example, documents an on/off control for its eSIM lines on both iOS and Android, confirming that active status can be toggled independently of deleting the profile.
The same principle applies to the home line. Disable it when it is not needed and switch it back on when the number matters again.
Not sure how much data you will actually use?
Estimate your daily data needs by country and compare eSIM against a local SIM before you land.
The simplest setup depends on whether you need the number
If you do not need the home line, turning it off gives the cleanest protection against accidental use.
If you do need it, keep it active but assign mobile data to the travel eSIM, control roaming settings per line and disable automatic data switching unless there is a deliberate reason to use it.
A travel eSIM does not require your home number to disappear. The goal is simply to give each line one clear job.
FAQ
01Do I have to turn off my primary SIM to use a travel eSIM?
No. Compatible dual-SIM phones can run a home line and a travel eSIM at the same time. The important step is assigning mobile data to the travel eSIM rather than the home line.
02Will I still be charged roaming fees if I keep my home SIM active?
Possibly, depending on your carrier and plan. Apple’s own guidance notes that even when a travel eSIM handles data, keeping the home line active can still trigger roaming fees, so check your carrier’s roaming terms before departure.
03How do I stop my home SIM from using mobile data abroad?
Select the travel eSIM as your default mobile-data line in your phone’s settings, then turn Data Roaming off for the home line. Also check automatic cellular-data switching so the phone cannot fall back to the home line on its own.
04Can receiving a text message still cost money on my home SIM?
It depends on your carrier’s roaming plan. Turning off mobile data does not automatically make calls, texts or voicemail free, so confirm the terms before you rely on the home line abroad.
05Can I temporarily disable my home SIM instead of deleting it?
Yes. Both iOS and Android, and eSIM providers such as Saily, support toggling a line active or inactive without removing its profile, so you can switch it back on the moment you need the number.
