SOS on iPhone: what it means and how to fix it

What SOS means on iPhone

Your iPhone normally connects to one network: your carrier’s, or a partner network your carrier lets you roam onto. When it can’t, but it can still hear some mobile network, it shows SOS or SOS only where the signal bars and carrier name usually sit.

That’s because emergency calls are treated differently. In most countries, any mobile network in range will connect a call to the emergency number, even if you aren’t its customer. SOS is the phone telling you that this is the only kind of call it can make right now.

While it says SOS:

• Emergency calls work over whichever network is in range.
• Ordinary calls, texts and mobile data don’t. Those need a network that recognises your line.
• Wi-fi still works. iMessage, FaceTime, WhatsApp and wi-fi calling (if your carrier supports it) carry on as normal on a wi-fi connection.

On a Dual SIM iPhone you may see SOS on one line and normal bars on the other. Each line registers on its own, so open Control Center or Settings › Cellular to see which line is affected.

SOS, No Service and satellite SOS

These look alike but mean different things, and the difference tells you where the problem is.

So SOS is, in a sense, good news. There is a network nearby; your phone just isn’t allowed to use it for anything but emergencies. That points to coverage, your account or your settings, not broken hardware.

Why your phone says SOS

• No coverage from your carrier where you are.Rural areas, basements, lifts and thick-walled buildings. Another network may reach you where yours doesn’t, which is exactly when SOS appears.
• You’re abroad and roaming isn’t available. Some plans have international roaming switched off on the account, or blocked by a spending cap, so the phone can only see local networks for emergencies.
• The SIM or eSIM line is inactive.A line you switched off in settings, a new SIM that hasn’t been activated, an eSIM that has expired, or an account suspended over an unpaid bill.
• A carrier outage.When a network goes down, every phone on it can drop to SOS at once. The large AT&T outage in February 2024 is the best-known example: iPhones across the US showed SOS for hours.
• A settings or software glitch. A stuck network registration, an outdated carrier settings file, or a physical SIM that has shifted in its tray.

How to fix SOS, step by step

Work down the list. The first three fix most cases in under a minute.

1. Move, then wait. Step outside or towards a window and give the phone a minute. If SOS clears, it was coverage.
2. Toggle airplane mode. Swipe into Control Center, turn airplane mode on, wait ten seconds, and turn it off. This makes the phone search for and register with a network from scratch. What airplane mode does covers why this works.
3. Check the line is switched on. Open Settings › Cellular (Mobile Data or Mobile Service in some regions), tap the line, and make sure Turn On This Line is enabled.
4. Select a network manually. In Settings › Cellular › Network Selection, turn off Automatic and wait for the list. Pick your carrier at home, or one of its partners abroad. Turn Automatic back on afterwards.
5. Restart the iPhone.A full restart often completes a registration that a toggle doesn’t.
6. Install updates. Open Settings › General › About and wait a few seconds: if a carrier settings update is available, iOS offers it. Then check Settings › General › Software Update.
7. Reseat a physical SIM. Eject the tray, check the card sits flat, and push it back in. Skip this on an eSIM.
8. Reset network settings. On recent iOS versions this is under Settings › General › Transfer or Reset iPhone › Reset › Reset Network Settings. It forgets saved wi-fi networks and passwords, so keep it until the end.

SOS after you land abroad

For travellers, SOS on arrival nearly always comes down to roaming. Your home line can only use a foreign network if your carrier has a deal with it and roaming is allowed on your account.

• Check roaming is on with your carrier.Some plans need international roaming switched on in the carrier’s app or account, and some block it once a spending limit is reached.
• Know what the Data Roaming toggle does. In Settings › Cellular › Cellular Data Options(per line, on a Dual SIM iPhone), Data Roaming controls mobile data abroad. Leaving it off is a sensible way to avoid charges. It stops data, not the phone’s connection to the network.
• Pick a partner network. If the automatic choice keeps landing on a network your carrier has no deal with, Network Selection (step 4 above) lets you choose one it does.

Using a travel eSIM instead

A travel eSIM sidesteps the home-line problem. It’s a second line, installed alongside your own SIM, that buys data on local partner networks at the destination. Your home carrier’s roaming deals don’t come into it.

If the travel line itself shows SOS or No Service, check three things:

1. The line is on. Settings › Cellular › the travel line › Turn On This Line.
2. Data Roaming is on for the travel line.It feels backwards, but a travel eSIM connects to a local network by roaming, so it can’t work with roaming off.
3. Cellular Data is set to the travel line. Under Settings › Cellular › Cellular Data, choose the eSIM, and leave your own line as the default for calls and texts. The guide to switching lines on iPhone walks through this screen.

Registration can take a couple of minutes after landing. Toggle airplane mode once before assuming anything is wrong. And because travel eSIMs are usually data-only, your home line can keep showing SOS for ordinary calls while the eSIM handles maps, messages and browsing.

Live prices for the destinations we’re asked about most:

• eSIM for United States — from €1.83
• eSIM for United Kingdom — from €1.24
• eSIM for France — from €1.05
• eSIM for Spain — from €1.24
• eSIM for Italy — from €1.24
• eSIM for Japan — from €1.11
• eSIM for Thailand — from €2.22
• eSIM for Turkey — from €1.24

When it still says SOS

If you’ve worked through every step and the line still shows SOS, the problem is probably with the account or the SIM, and only your carrier can see that. Ask them to check:

• whether the line is active and the account in good standing;
• whether there’s an outage in your area;
• whether roaming is enabled, if you’re abroad;
• whether the SIM or eSIM needs replacing.

If it’s one of our travel eSIMs that won’t connect, get in touchwith your order reference and we’ll check the line’s status at the network. The install guidealso has a troubleshooting table for “No Service” after setup.