Your phone says "No Service" abroad: here is what is actually going wrong
You have landed, cleared passport control, and you are standing in the arrivals hall doing the thing everyone does: holding your phone up slightly, as if another few inches of height will summon a signal. The eSIM you bought before the trip is installed. You followed the instructions. And yet the top of the screen reads "No Service" or "Searching", and nothing will load. It is a deflating moment, and it is also an extremely common one. The reassuring news is that a phone in this state is almost never broken, and the fix is rarely complicated. In the large majority of cases, one setting is in the wrong position. This guide walks through why it happens and how to put it right, on both iPhone and Android, in the order worth trying.
First, understand what "No Service" is telling you
It helps to know that there are really two different failures hiding behind similar symptoms, because they have different cures. The first is no signal at all: the status bar shows "No Service" or "Searching", which means your phone has not registered on any local network yet. The second is signal but no internet: you have bars, maybe even a 4G or 5G icon, but web pages stall and apps spin forever. That second one feels like a connection problem but is usually a settings problem, and people waste a lot of time restarting their phone when the real culprit is elsewhere. Keep the distinction in mind as you go, because it tells you which fixes are worth your time.
The setting that catches almost everyone: data roaming
If you only check one thing, check this. Travel eSIMs work by connecting you to a local partner network in the country you are visiting, and your phone classifies that as roaming, even though you are on a dedicated travel plan and not your home contract. Most phones ship with data roaming switched off by default, which is sensible protection against bill shock at home but is exactly the thing standing between you and the internet abroad. If roaming is off for your eSIM line, you can have perfect signal and still get nothing.
There is a point here that trips up nervous travellers, so let me state it plainly. Turning on data roaming for your travel eSIM does not trigger expensive charges from your home network. You are using the data allowance you already paid for on the eSIM, not your home carrier's pricey roaming service. The roaming toggle simply gives your eSIM permission to use the local networks it was designed to use. Leave roaming switched off on your home line if you want, and switch it on only for the eSIM.
On an iPhone, open Settings, tap Cellular or Mobile Data, tap your travel eSIM line, then Cellular Data Options, and turn Data Roaming on. On Android the path varies a little by manufacturer, but it is broadly Settings, then Connections or Network and internet, then Mobile networks or SIMs, select your eSIM, and switch Data Roaming on. Give it ten to thirty seconds after toggling it; the phone often needs a moment to register and the signal can appear after a short pause.
The second most common trap: the wrong line is set for data
Most modern phones run two lines at once, your home number and your travel eSIM, and only one of them can be the active data line at any given time. If your phone is still pointing at your home SIM for data while you are abroad, your eSIM sits there fully working but unused, and you see no internet. This is the classic "I installed it but nothing happens" situation.
On an iPhone, go to Settings, then Cellular, tap Cellular Data near the top, and make sure your travel eSIM is selected rather than your home line. On Android, look under Settings, then Connections or Network and internet, into the SIM or SIM manager section, and set your eSIM as the preferred SIM for mobile data. It is a small switch and easy to overlook, but it is the difference between a plan that works and a plan that just sits idle.
An iPhone setting worth knowing about: Cellular Data Switching
This one deserves its own mention because it causes a particularly maddening problem: the connection that works for a while and then quietly dies. iPhones have a feature called Allow Cellular Data Switching, which lets the phone fall back to your other line for data when it thinks coverage is poor. Abroad, that means your iPhone can silently flip from your travel eSIM back to your home SIM in a weak-signal moment, which both interrupts your data and can land you with the home roaming charges you were trying to avoid.
If your data keeps dropping or you are worried about your home line being used behind your back, turn this off. Go to Settings, then Cellular or Cellular Data, and switch off Allow Cellular Data Switching. With it off, the phone stays on the line you told it to use and does not improvise. Android does not have a direct equivalent of this exact toggle, but the same principle applies: make sure your eSIM is firmly set as the data SIM so the phone is not tempted to wander.
Signal but still no internet? Look at the APN
If you have confirmed roaming is on, the right line is selected, and you genuinely have bars but pages will not load, the likely suspect is the APN, or Access Point Name. Think of it as the address your phone uses to reach the mobile data network. If that address is blank or wrong, your phone can see the network perfectly well but cannot actually pass data through it, which produces the frustrating signal-without-internet state.
The good news is that most travel eSIMs configure the APN automatically, and iPhones in particular usually handle it for you and often do not even let you edit it manually. So before you start typing anything, do not assume the APN is the problem; it is lower down the list than roaming and line selection for a reason. If your provider has given you a specific APN to enter, your activation email is where it will be, and the path on Android is Settings, Connections, Mobile networks, Access Point Names. On iPhone, if an APN field is available at all, it sits under your eSIM line in the Cellular settings. When in doubt, the cleaner fix is usually the next step rather than hand-editing network addresses.
The fixes that clear up the odd, stubborn cases
A few simple actions resolve a surprising share of the remaining problems, and they are worth running through before you contact anyone. Switch airplane mode on, wait around fifteen seconds, and switch it off again; this forces your phone to search for and re-register on the local network from scratch, and it often does the trick on its own, especially just after you land. Failing that, a full restart clears temporary glitches that can linger after a long flight or a border crossing.
If you are still stuck, try selecting a network by hand. Phones are set to choose a network automatically, but occasionally they latch onto the wrong one or fail to commit to any. On iPhone this lives under Settings, Cellular, Network Selection; on Android, under the mobile networks menu as Network operators. Turn off the automatic option, wait for the list of available networks to populate, and pick one manually. If your eSIM provider lists preferred local partners, choose one of those. As a last resort, resetting network settings clears any corrupted configuration, though be aware it also wipes saved Wi-Fi passwords, so keep those to hand before you do it.
A quick checklist if it was working and suddenly stopped
Sometimes the connection is fine for days and then falls over, often after crossing a border into a new country. When that happens, the questions are slightly different. Has the plan simply run out of data or expired? It sounds obvious, but it is the first thing to rule out. Has your phone failed to re-register after the border crossing, in which case airplane mode off and on, or a restart, usually sorts it? And is your eSIM still set as the data line, since an update or a reboot can occasionally reset that preference? Run through those three before assuming anything is seriously wrong.
When it really is not you
Most "No Service" episodes come down to the settings above, but not every one. Coverage genuinely varies, and a remote valley or a thick-walled building can defeat any plan. Some plans also activate only once you reach the destination and connect to a supported network, so a plan that looks dead at the airport may simply be waiting to come alive. And occasionally there is a real compatibility quirk between a particular handset and a particular network. If you have worked through everything here and still have nothing, that is the point to contact your eSIM provider, ideally over hotel or airport Wi-Fi, with your phone model and operating system version ready, rather than continuing to change settings and risk making things worse.
The settings names and menu paths described here reflect current versions of iOS and Android, but Apple and the various Android manufacturers do move things around between releases, and the exact wording can differ from one phone to another. Treat this as a reliable map rather than a guarantee, and if a menu does not match precisely, the equivalent option is usually a tap or two away. The underlying logic, roaming on, correct data line, then everything else, holds true across devices.
Choosing a plan that makes this less likely in the first place
A good deal of connection grief is avoidable at the buying stage. A plan with solid coverage for your specific destination, clear setup instructions, and automatic APN configuration takes most of the guesswork out of that arrivals-hall moment. If you are still deciding what to buy, comparing plans side by side by destination, data allowance, validity and price is the simplest way to find one that fits your trip and your phone, so the first thing you do after landing is get online rather than troubleshoot.
