eSIM keeps disconnecting: why it drops and how to stop it

An eSIM that keeps disconnecting is almost always a network problem, not a profile problem. The eSIM is a file sitting in the phone's chip: it does not come and go. What comes and goes is the connection to a partner network abroad, and there are five reasons that happens. Four of them you can fix from the settings in a couple of minutes.

Your two lines are taking turns on one radio

Most phones hold two lines but have one set of radios to share between them. While the second line does its periodic check for signal, or receives a call or a text, data on the first line pauses. On a good connection you never notice. On a weak one, that pause is the moment the bar drops to "No Service" and the page stops loading.

This is the most common cause of a connection that keeps flickering, and the simplest to test: turn the line you are not using off for an hour and see if the flicker stops.

• iPhone: Settings, then Mobile Data (or Cellular), tap the other line, and use "Turn On This Line" to switch it off.
• Samsung: Settings, then Connections, then SIM manager, and tap the switch next to the line you want off.

The phone keeps falling back to a weaker partner

A travel eSIM does not have one network at your destination, it has an agreement with a group of them. The phone picks whichever one it likes at that second, and "whichever one it likes" is decided on signal strength alone. A tower that is close but overloaded, or one that only carries voice for visitors, can look better to the phone than the network that actually carries your data well.

So the phone hops. Every hop is a few seconds of nothing.

Network selection is stuck on an operator that will not serve you

The other half of the same problem. If someone once set network selection by hand, or if the phone latched onto an operator at the airport and kept it, you can end up parked on a network your plan has no agreement with. The phone shows bars, because bars mean "I can hear a tower", not "that tower will carry my data". You get signal and no internet, coming and going as the phone gives up and tries again.

Fix it by choosing on purpose instead of leaving it to chance, which is in the "what helps" list below.

5G is newer than the roaming agreements behind it

Roaming runs on old plumbing, and 5G standalone is the newest layer of it. Syniverse wrote in April 2026 that around 25 operators planned to launch standalone 5G roaming during that year, and that nearly 80 percent admitted they were not fully ready. Almost all 5G you meet as a visitor is the non standalone kind, which leans on the 4G core underneath.

The practical effect: a phone that insists on 5G abroad can spend its time bouncing between a 5G cell that will not complete the handover and the 4G one that would have worked. Forcing 4G for a test is not giving up speed, it is removing a variable.

The plan is out of data, and the phone does not announce it

When a data allowance is finished, some networks do not cut the line cleanly. They leave you attached with no throughput, which on the phone looks exactly like a connection that keeps dropping: signal present, nothing loading, occasionally a page gets through.

Check the remaining data in the app before touching a single setting. It takes ten seconds and rules out an hour of fiddling.

What actually helps

In this order.

1. Airplane mode on for fifteen seconds, then off. It forces a fresh search instead of the stale choice the phone is defending. This is still the fix that works most often.
2. Choose the network by hand. On iPhone: Settings, Mobile Data, tap the eSIM, then Network Selection, turn off Automatic, wait for the list and pick one of the operators your plan uses. On Samsung: Settings, Connections, Mobile networks, Network operators, then turn off automatic selection and choose. The plan page lists which operators to look for. If the one you pick turns out to be worse, go back and try the next.
3. Turn 5G off for a test. On iPhone: Settings, Mobile Data, Mobile Data Options, Voice & Data, and pick LTE. On Samsung: Settings, Connections, Mobile networks, Network mode, and choose an option without 5G. If the drops stop, you know what it was, and you can put 5G back later.
4. Keep one data line active. Data on the travel eSIM, data roaming off on your home line, and the home line switched off entirely if you do not need its texts.

If it still drops after all four, that is worth telling us rather than guessing at it. Write to support with your phone model, the country, and which operator name the phone is showing. That name tells us more than anything else in the message.

Quick answers

Why does it always start at the airport?

Because that is where the phone made its first choice, in a building full of competing signals, and phones are stubborn about a choice once made. A round of airplane mode after you leave the terminal clears it.

Does an eSIM wear out or expire mid trip?

No. The profile does not degrade. What can end is the plan's validity or its data, both of which the app shows, and both of which look like a dying connection from the outside.

Is it worth deleting and reinstalling the eSIM?

Almost never, and it is the one move you cannot undo: many profiles can only be installed once. Try everything above first, and ask us before deleting anything.