Why Does My iPhone Have No Signal? What to Try
There are few things more frustrating than picking up your iPhone and suddenly discovering you have no mobile signal.
You might see No Service, Searching or SOS Only at the top of your screen, or perhaps your signal bars have simply disappeared.
The good news is that it doesn’t necessarily mean there’s anything wrong with your iPhone.
Signal problems can be caused by everything from a temporary issue with your mobile phone operator to a simple setting on your iPhone.
Before assuming the worst, here are a few things worth trying.
What does SOS Only mean on an iPhone?
If your iPhone displays SOS Only, it means it isn’t currently connected to your normal mobile phone operator.
However, your iPhone may still be able to connect to another available mobile network for emergency calls.
Seeing SOS Only doesn’t automatically mean your SIM, eSIM or iPhone has developed a fault.
It can simply happen when you’re somewhere with poor coverage or when your mobile phone operator is experiencing a temporary problem.
1. Check if you’re somewhere with poor signal
This might sound obvious, but location can make a huge difference to mobile coverage.
Buildings with thick walls, basements, rural areas and even certain parts of your home can have much weaker mobile reception.
If possible, move somewhere else and see if the signal returns.
Going outside or moving closer to a window can sometimes be enough to reconnect your iPhone.
If your signal comes back as soon as you change location, your iPhone is probably working normally and you’re simply in an area with weak coverage.
2. Check whether your mobile phone operator has a problem
Sometimes there is absolutely nothing wrong with your iPhone.
Your mobile phone operator could be experiencing an outage, carrying out maintenance or having a temporary problem with a mast in your area.
If another person using the same mobile phone operator is nearby, ask whether their phone has signal.
You can also use Wi-Fi to check your mobile phone operator’s website or service status page.
If lots of customers are experiencing the same problem, changing settings on your iPhone probably isn’t going to fix it. You may simply need to wait for the service to return.
3. Turn Airplane Mode on and off
This is one of the quickest things to try and it can surprisingly often solve temporary connection problems.
Open Settings and turn Airplane Mode on.
Wait around 10 seconds, then turn it back off.
Your iPhone will start searching for your mobile phone operator again and may reconnect normally.
4. Restart your iPhone
The classic tech fix is still worth trying.
Restarting your iPhone forces various services to reload and can clear temporary software or mobile connection problems.
Once your iPhone has restarted, give it a minute or two to reconnect to the mobile network.
If your signal bars return, it was probably just a temporary glitch.
5. Make sure Mobile Data is switched on
If you have signal but can’t use the internet away from Wi-Fi, check that Mobile Data hasn’t accidentally been switched off.
Go to:
Settings > Mobile Service
Make sure Mobile Data is enabled.
If you’re using more than one SIM or eSIM, also check that the correct mobile number is selected for your mobile data connection.
It’s worth remembering that Mobile Data being switched off doesn’t normally cause the actual signal bars to disappear, but it can make it appear as though your mobile connection isn’t working properly.
6. Check for an iPhone software update
Keeping your iPhone updated is always a good idea, particularly if you’re experiencing unexpected connection problems.
Connect your iPhone to Wi-Fi and go to:
Settings > General > Software Update
If an update is available, you can install it from here.
Software updates can include bug fixes and improvements that affect mobile connectivity.
7. Check for updated mobile phone operator settings
Your iPhone also has a separate set of settings that help it communicate with your mobile phone operator.
These can occasionally receive updates.
Connect your iPhone to Wi-Fi and go to:
Settings > General > About
Stay on this screen for a short while.
If an update to your mobile phone operator settings is available, your iPhone should display a message asking you to install it.
If nothing appears, there’s usually nothing you need to do.
8. Check your SIM or eSIM
Your mobile service is connected to either a physical SIM card or an eSIM.
If you’re using an eSIM, open your mobile settings and make sure your mobile line hasn’t accidentally been switched off.
If your iPhone uses a physical SIM card, a problem with the SIM itself could potentially stop your phone connecting to your mobile phone operator.
If you’ve recently changed SIM cards, moved to an eSIM or changed your mobile plan, contacting your mobile phone operator may be the quickest way of checking that everything has been activated correctly.
9. Are you abroad?
If your iPhone loses its mobile data connection while travelling, check your roaming settings.
Go to:
Settings > Mobile Service > Mobile Data Options
You may need to enable Data Roaming to use mobile data while abroad.
Before doing this, it’s worth checking what your mobile phone operator charges for roaming at your destination.
Roaming charges and allowances can vary depending on your plan and where you’re travelling.
10. Reset your network settings
If you’ve tried everything else and your iPhone still won’t connect, resetting the network settings is another option.
Go to:
Settings > General > Transfer or Reset iPhone > Reset > Reset Network Settings
This doesn’t delete your photos, apps or other personal data.
However, it does remove saved network information, including Wi-Fi networks and passwords, along with some mobile, VPN and APN settings.
You’ll therefore need to reconnect to your Wi-Fi networks afterwards.
Because of that, we’d leave this one until you’ve tried the simpler fixes first.
Still have no signal?
If your iPhone continues showing No Service or SOS Only, the next step is probably to contact your mobile phone operator.
They can check whether there is an issue with your account, SIM or eSIM, as well as checking for problems affecting mobile coverage in your area.
If your mobile phone operator confirms that everything looks fine at their end, there could potentially be a problem with the iPhone itself.
This becomes more likely if the phone has recently been dropped, damaged or exposed to liquid.
At that point, it may be worth contacting Apple or an authorised repair provider to have the iPhone checked.
Basically…
If your iPhone suddenly has no signal, don’t panic.
Start with the simple things. Move to another location, check whether your mobile phone operator is having problems, toggle Airplane Mode and restart your iPhone.
Most sudden signal problems are temporary and don’t mean your iPhone is broken.
If the problem continues everywhere you go, your mobile phone operator should be your next port of call. If they can’t find anything wrong, it may then be time to have the iPhone itself checked.
