No network abroad even though roaming is on: what to check

You landed, roaming is switched on, and the phone has found nothing: no carrier name, no bars, sometimes SOS, sometimes an endless search. This is not a data problem. The phone is failing to register on any network at all, and the cause is usually the contract behind the line, not the phone in your hand.

Two neighbouring problems have their own guides, so you do not waste time here. If you have bars and a carrier name but pages will not load, read data roaming on but no internet. If it is specifically a travel eSIM profile sitting in the list of lines with No Service next to it, read eSIM installed but no service. What follows is for a status bar that stays empty, on your home line or on a travel line.

Go in this order.

1. Fifteen seconds of airplane mode, then a restart

Apple's own first step for SOS, No Service and Searching is to turn Airplane Mode on for at least 15 seconds and then off again. It works far more often than it has any right to: the phone drops everything it was clinging to from the last country and scans from scratch.

If that does nothing, restart the phone, then check for a carrier settings update in Settings, General, About on iPhone. An update only appears if there is one waiting, and it is worth a look before you blame anything else.

2. Is roaming switched on for the contract, not just on the phone?

There are two separate switches with almost the same name, and people only ever find one of them.

• The phone switch is Data Roaming, per line, in the phone's settings.
• The account switch lives with your carrier, and on many prepaid plans it is off until you ask for it. Vodafone Australia, to take one operator that spells it out, tells prepaid customers to make sure international roaming is switched on in My Vodafone before they travel.

The awkward part is the timing. Turning it on usually needs an app, a web login or a confirmation SMS, and all three are easier from home than from an airport with no signal. Check it the week before you fly, not at the gate.

3. Has the carrier barred the line?

Apple's troubleshooting list ends where no setting can help: contact your carrier to verify that the account is active and in good standing, and that the device is not blocked or barred from receiving cellular services. In practice that covers an unpaid bill, a line opened in the last few weeks that has not cleared the carrier's fraud checks, a credit limit reached mid trip, or a carrier that asks for a deposit before it will let a line roam.

A barred line behaves exactly like a broken phone. Nothing in Settings changes it, and the only route back is the carrier's app or chat over hotel Wi-Fi.

4. SOS and SOS only: what they actually mean

Apple defines it plainly: SOS or SOS only means the device is not connected to your cellular network, but you can still make emergency calls through other carriers' networks. Apple notes this indicator is available in Australia, Canada and the United States; elsewhere the same situation shows up as No Service.

The useful thing to take from it is what SOS rules out. If emergency calling works, the radio works, the antenna works, and the phone can see networks around it. They are simply refusing to carry your line. That points at causes 2, 3 and 5, not at a hardware fault.

5. The phone may be too old for the networks that are left

This is the cause that catches people who roamed happily in the same country two years ago.

The networks that older phones fell back on are disappearing. GSA's 2G and 3G Switch-Off report of August 2026 counts 313 completed, planned or in-progress 2G and 3G switch-offs across 89 countries and territories, and of the 174 operators that started retiring 3G, 102 have finished. In the UK, Ofcom states that all four mobile network operators have now completed their 3G switch-offs.

That matters because of how older handsets place calls. Ofcom describes a non-VoLTE handset as a 4G phone without the ability to make voice calls over LTE, broadly the ones released between about 2012 and 2014, which operators pushed onto 3G or 2G whenever a call started. Take the 3G away and there is nowhere to push them. Google says the same about the shutdowns: devices that do not support VoLTE, or VoLTE roaming, may lose voice calling services, including emergency calls, or connectivity altogether.

Where to look:

• iPhone: Settings, Cellular (Mobile Data in British English), then Cellular Data Options. Depending on the model you will see Voice & Data, or Enable LTE on older ones.
• Samsung Galaxy: Settings, Connections, Mobile networks, where Samsung lists Network mode and Enhanced Calling, described as enhanced communication using LTE data.

If there is no VoLTE or LTE calling option at all and the phone is from that 2012 to 2014 window, you have your answer, and a data-only travel line will still work on it where the calling will not.

6. Was the phone bought in another region?

Apple states that cellular technology support is based on the iPhone model number. The same generation is sold as several regional variants that do not support the same set of bands, and the same is true across Android makers. A phone bought in one continent can arrive in another and find only a fraction of what is on the air, or nothing at all in a country that leans on a band it never had.

To check: Settings, General, About, then tap the part number to switch it to the model number, which begins with A. Look that number up on Apple's tech specs page for the model. For Android, the maker's spec sheet lists bands per model code.

Nothing fixes this on the road. It is a reason to test a second-hand import before a trip rather than after landing.

7. Network selection stuck on manual

If anyone ever picked an operator by hand, the phone keeps hunting for that one operator and finds nothing abroad. On iPhone it is Settings, Cellular, Network Selection, with Automatic back on. On Samsung it is Settings, Connections, Mobile networks, Network operators, then Select automatically. The per-phone detail is in the eSIM installed but no service guide.

When to ask

If none of the seven applies, write to support with the phone model, the country you are in, and what the status bar says exactly: No Service, SOS, Searching and a carrier name are four different symptoms and they lead to different answers.

Quick answers

It worked in this country two years ago. What changed?

Most likely the 3G network it used to fall back on was switched off in between. A phone without VoLTE loses calling first and can lose usable service entirely. The fastest test is to borrow a recent phone for five minutes in the same spot.

The phone says SOS but emergency calls work. Is it broken?

No, and that is the point of the indicator. Apple's own definition is that you are not connected to your own network while emergency calls go through other carriers. Hardware and radio are fine. Look at the contract, the bar, or the network generation instead.

Can a travel eSIM get around a carrier that will not let me roam?

Yes, because it is its own line and owes nothing to your home contract. Two conditions: the phone must be eSIM capable and not carrier locked, and you should know what you are buying. Wigoo plans are data only, so maps, messaging and calls over apps work on that line, while ordinary calls and carrier SMS stay with your home number.