If you travel often you will accumulate eSIM profiles: one from a trip to Morocco, one from Japan, one for work. Phones handle this well, but there are two numbers people confuse — how many profiles a phone can store, and how many it can have active at once.
Stored versus active
Stored means the profile sits on the phone's eSIM chip, switched off, taking up a slot. Recent iPhones store roughly eight or more; older models and many Android handsets store fewer. Storage is limited, and when it fills, new installations fail with an unhelpful error.
Active means the line is switched on and registered to a network. Most dual-SIM phones run two lines at once — typically your physical SIM plus one eSIM, or two eSIMs on models with no physical tray. A few recent handsets manage two active eSIMs alongside a physical SIM.
The practical upshot: you can keep a library of travel eSIMs on the phone and switch on whichever country you are in, but you cannot have five of them running simultaneously.
Label them, immediately
This is the single highest-value habit. By default, lines get named things like "Secondary" or the provider's name, and after three trips you will have no idea which is which. When you install a profile, rename it to something you will recognise in a year: Morocco Feb 27, Work, Japan.
On iPhone this is Settings → Cellular → [the line] → Cellular Plan Label. On Android it varies by manufacturer but sits in the SIM or network settings.
Switching between profiles
Turning a line on or off does not delete it. On iPhone, Settings → Cellular, tap the plan, and toggle Turn On This Line. The profile stays stored either way.
Three settings decide behaviour once more than one line is active, and all three are separate:
- Mobile data — which line carries data. This is the one that matters when you land somewhere new.
- Default voice line — which number outgoing calls come from.
- iMessage & FaceTime — which number those are tied to, independently of the above.
People commonly switch the data line and then wonder why calls still go out on the expensive one. Check all three.
Turn off "Allow Cellular Data Switching"
iPhone has a setting that lets the phone fall back to your other line when the primary has poor coverage. On paper it is helpful. Abroad, it means your home SIM can silently pick up data at full roaming rates while you believe you are on your travel plan.
Before you travel, go to Settings → Cellular → Cellular Data and make sure Allow Cellular Data Switching is off. Better still, turn data off entirely for the home line and leave it on only for calls and texts.
The irreversible mistake
Deleting an eSIM profile is, in almost all cases, permanent. The activation QR code was single-use and is spent. Removing the profile to "free up space" therefore destroys any remaining validity on that plan, and reinstalling from the original code will fail.
Before deleting anything, ask whether the plan still has time or data left. If it does, switch the line off instead — a stored, inactive profile consumes nothing.
Only delete profiles that are genuinely expired, and if you are unsure whether a provider supports reinstallation, ask them first. Some do; most do not.
Housekeeping that actually helps
- Delete expired profiles once a year, not more often, and only after confirming they are dead.
- Keep the confirmation emails. They are the only record most providers can work from if something needs reissuing.
- Check free slots before you buy for the next trip, not at the airport. A full eSIM store is a nasty surprise on arrival.
- Do not transfer a travel eSIM to a new phone casually. Some providers allow a one-time transfer; many do not, and a failed attempt can lose the profile entirely.
A sensible setup for a trip
The arrangement that causes the fewest problems: physical SIM (or home eSIM) stays active for calls and SMS with its data switched off, travel eSIM active and set as the data line with roaming enabled for that line, cellular data switching off, both lines clearly labelled.
That gives you your normal number for bank codes and calls from home, local data at local prices, and no way for the expensive line to quietly pick up the slack.
If you are heading to Morocco, our duration-based plans install as a second line alongside whatever you already have, and validity only starts when you first connect on arrival.