eSIM Not Working? How to Fix No Service, No Internet and Failed Installs

Start with what your screen is actually showing

Four symptoms cover nearly every case, and they are not variations on one problem. "No Service" with no carrier name means your phone hasn't joined a network at all. Bars showing but pages not loading means it joined one and your data isn't being routed through it. Working yesterday and dead today usually points at the plan rather than the phone. And an install that refuses to complete never got as far as being a connection problem in the first place.

There's a shortcut that halves the problem before you change a single setting: open your Lumbus dashboard and read the eSIM's status. Ready to install means the profile has never been installed and switched on — that's a phone-side or install-side issue, so sections two and five are where to look. Activated, In use, Out of data or Expired all mean the eSIM was installed and running at some point, which rules out half the possible causes immediately.

On an eSIM that has activated, the dashboard also shows the data remaining, with a small refresh control beside it. If that figure is going down, the eSIM is working right now and something on the phone is consuming it while your browser sits on a blank page — a VPN is the first thing to rule out. Unlimited plans are the exception: they show a daily-allowance note rather than a countdown, so there's no figure to watch.

• No carrier name, "No Service" or "SOS" — go to section two
• Bars or 5G showing, but nothing loads — go to section three
• Worked earlier in the trip, then stopped — go to section four
• The install fails or the code is rejected — go to section five

"No Service" or no network name at all

Data Roaming is the first thing to check and, by a wide margin, the most common cause. A travel eSIM is always roaming — it is a foreign profile visiting a local network — so with that switch off the phone will not register anywhere. On iPhone: Settings, Cellular, tap the travel eSIM, turn Data Roaming on. On Android: Settings, Network and internet, SIMs, tap the travel eSIM, turn Roaming on. Enabling it for the travel eSIM does not enable it for your home line; those are separate switches.

Second: have you actually arrived? A destination eSIM has nothing to connect to until you're inside its coverage area. Installing at home is the right move, but it will show no service until you land. If you've just landed, give it two or three minutes before assuming anything is wrong.

If it's still empty after a few minutes, toggle airplane mode on, wait ten seconds, then turn it off. That forces a fresh network search and resolves a large share of arrival-day cases on its own. A full restart is the next step up if it doesn't take.

Still nothing? Pick a network by hand. On iPhone: Settings, Cellular, tap the eSIM, Network Selection, turn Automatic off and choose one of the listed carriers. On Android the same option sits in the SIM's settings as network or operator selection. Automatic selection occasionally latches onto a network your plan has no agreement with, and choosing manually steps around it.

Two less common causes are worth knowing. Russian eSIMs need one extra step: MTS sends an SMS with a registration link that has to be completed before data flows. And check the plan's coverage list against where you're standing — a regional plan that doesn't include your current country shows exactly this symptom, and nothing you change on the phone will fix it.

Full bars, but nothing loads

If the phone has joined a network, the profile works. What's left is routing: you're connected through the travel eSIM but still sending data somewhere else, usually your home line.

Set the data line explicitly. On iPhone: Settings, Cellular, Cellular Data, and select the travel eSIM. On Android: Settings, Network and internet, SIMs, and set Mobile data to the travel eSIM. Phones don't always switch across on their own when a new line appears, and the setting has a habit of reverting after a restart — check it again if the problem returns.

While you're there, turn your home line's data roaming off. That does two useful things: it removes any ambiguity about which line carries data, and it protects you from a roaming bill if the phone falls back to your carrier. Leave the home line itself switched on if you want calls and texts to keep reaching you — receiving an SMS doesn't require data roaming.

Rule out a VPN or content blocker. A VPN set up for your home connection can leave you with full bars and no working apps once you're on a foreign network. Turn it off, load a page, then switch it back on afterwards if you need it.

If all of that is right and pages still won't load, look for an APN in your activation email. Most plans configure themselves, so that field is usually empty and that's normal — but where one is supplied, entering it under the eSIM's cellular network settings is the fix. And check the dashboard: an eSIM with no data left behaves exactly like a broken one.

It worked yesterday, and now it doesn't

A connection that stops mid-trip is almost always the plan reaching one of its two limits rather than a fault. Either the data ran out or the validity window closed, and both are visible in the dashboard in seconds — Out of data and Expired are separate statuses for exactly this reason. Unlimited plans are the exception: they can't run out of data, so only Expired applies to them.

If it's data, a top-up adds more to the same eSIM. Nothing is reinstalled, there's no new QR code and no new install link — the eSIM you already have starts working again, and the top-up's days are added to whatever days you had left.

If it's the validity window, the thing that surprises people is when the clock started. Not at purchase, and not at install: it starts the first time the eSIM connects to a network at your destination. Install at home on Wi-Fi as early as you like — the countdown waits for the connection, not the calendar.

A quieter cause is the daily reset on unlimited plans. Once the full-speed allowance for the day is used, everything still works but slowly, which reads as broken when a video won't start. Messaging and maps carry on fine at the reduced speed, and full speed returns at the next daily reset.

The install itself won't go through

"Unable to Add Cellular Plan" on an iPhone, or a rejected code on Android, is a different class of problem: nothing has been installed, so nothing can be misconfigured yet.

Start with the connection you're installing over. Downloading an eSIM profile needs working internet — and it can't be the eSIM you're trying to install. Home Wi-Fi before you fly is the ideal moment. Airport Wi-Fi that needs a captive-portal login often half-works and stalls the download partway.

If the code is rejected outright, the usual reason is that it has already been used. Each eSIM installs on one device — a property of the profile, not a policy we invented — so a code that's live on a phone won't install on a tablet or a second handset. Deleting it from the first device and reinstalling on that same phone generally works; moving an activated eSIM to a different phone does not.

Check the handset too. A carrier-locked phone will reject any eSIM that isn't its own carrier's. Phones also hold only so many stored eSIM profiles, so clearing out old expired ones frees space — just be careful which ones you remove, and make sure a plan is genuinely finished before deleting it.

If an install link or QR code from an older email now errors, request a fresh one rather than assuming the eSIM is gone; links are time-limited by design. The exception is an eSIM that was cancelled or released — a free claim that went past its window, for instance — where the old links stop working permanently and there's nothing left to reinstall.

Before you delete anything

The instinct when something won't work is to delete it and start again. With an eSIM that's the one move worth resisting until everything else has been tried, because it's the only step that can actually cost you something.

The safe order is: toggle airplane mode, restart the phone, check Data Roaming, check which line carries data, check the dashboard status. Every one of those is reversible. Deleting the profile is not reversible in the same way — you can usually reinstall it on the same phone from the original link while the plan is still valid, active and has data left, but "usually" is doing real work in that sentence.

Don't buy a second eSIM to test the theory either. Two travel profiles competing for the same data line makes diagnosis harder, and the first one was almost certainly fine.

If you've worked through your symptom's section and it's still dead, contact support rather than experimenting further — and include four things: the email you ordered with, the destination, exactly what the screen says, and whether the dashboard still shows the eSIM as Ready to install. That last detail alone tells us which half of the problem we're looking at, and usually turns a day of back-and-forth into a single reply.

• Do: toggle airplane mode, restart, check Data Roaming, check the data line
• Do: read the dashboard status before changing anything on the phone
• Don't: delete the profile as a first move
• Don't: buy a second eSIM to test whether the first one works
• Don't: factory reset the phone — no eSIM problem needs it