Some users have complained that they see the No Service message on their iPhones after upgrading to the latest iOS. When your iPhone or iPad says “No Service”, you can’t make or receive phone calls or send SMS/MMS text messages. And you can only connect to the internet using WiFi.
There are a few different options to address this No Service issue on your iPhone or iPad.
Contents
Check Your Coverage
Make sure that you’re in an area with cellular network coverage
- Check that cellular data is on in Settings > Cellular
- On your iPad, go to Settings > Cellular Data
- If you’re traveling internationally, set up data roaming
- Go to Settings > Cellular > Cellular Data Options > Data Roaming
- Check your carrier plan for charges associated with data roaming before you turn it on
Toggle LTE Off
Quite a few readers tell us that turning off LTE helped their iPhones regain connectivity.
Go to Settings > Cellular > Cellular Data Option > Enable LTE > Off 
Turning LTE off usually indicates the problem is with nearby towers, so it’s a temporary problem. Once you move to a different area, try turning LTE back on and see if the problem goes away.
Reset Network Settings
- Go to Settings > General > Reset > Reset Network Settings
- This resets WiFi networks and passwords, cellular settings, and VPN and APN settings so have them on-hand to re-enter
- This resets WiFi networks and passwords, cellular settings, and VPN and APN settings so have them on-hand to re-enter
Look For A Carrier Settings Update
- Connect to a WiFi or cellular network
- Tap Settings > General > About
- If an update is available, you see an option to update your carrier settings
- If an update is available, you see an option to update your carrier settings
Whenever you insert a new SIM card into your iPhone or iPad, you need to download the carrier settings for your new carrier.
Turn Off Cellular Data
Before proceeding to any complicated solutions, try to switch off the cellular data to “Off” in your settings by going to Settings > Cellular > Cellular Data. 
Next, put your device to Airplane mode and then turn it off for a minute or so. Power back your iPhone, switch off your Airplane mode and then enable the Cellular data option. This should address the problem.
Restart your iPhone
Restart your iPhone X Series
- Press and hold the Side button and either volume button until the slider appears
- Drag the slider to turn your iPhone X completely off
- After your iPhone X turns off, press and hold the Side button again until you see the Apple logo
For older models with a Home Button
- Press and hold the Top or Side button until the slider appears
- Drag the slider to turn your device completely off
- After the device turns off, press and hold the Top (or Side) button again until you see the Apple logo
Using iOS 11 or Higher?
Turn off your device by going to Settings > General> Shut Down. Then power up normally. 
Discharge Your Phone or iPad Completely
A few readers discovered that by discharging their iPhones and then charging it back up to 100% fixed the No Service Problem for them.
To discharge your device quickly, disconnect it from any charging and play videos on auto-play to quickly drain the battery down.
Sim Card
The next option although takes a little effort has proved handy in the prior iOS versions when users faced this problem.
- Switch off your iPhone and remove the SIM Card from the SIM tray. To pop open the SIM tray, insert a paper clip or a SIM-eject tool into the hole beside the SIM tray
- Find the SIM tray on the right side of your iPhone 4-X Series
- Locate the SIM tray on the top for the original iPhone and Phone 3 series phones
- Find the SIM tray on the right side, near the bottom on iPads Air, Pro, Mini, and 5th generations
- Locate the SIM tray on the left side, near the top on iPad 2, 3G, 3rd generation, and 4th generation
- Next, Switch on your iPhone, unlock the device and insert back the SIM card back to the device
Suspect Water or Liquid Damage?
If your device recently got wet (or soaked) then it’s quite possible that there’s some serious water or liquid damage.
To check for water damage, look just inside your SIM tray to inspect the LCI ( Liquid Contact Indicators.) 
The LCI activates when it contacts any water or liquid, turning from white or silver to red.
Unfortunately, if your iDevice shows an active LCI, Apple will not repair it and liquid damage is not currently covered by Apple’s warranty!
Talk To Apple Support
If you tried everything listed and you still see the No Service indicator, it’s time to reach out to Apple. 
It’s possible that your iPhone has a hardware issue and repair or replacement is in order.
We recommend chatting with Apple Support online–it’s often the fastest way to get to a support team member.
However, if you want to meet face to face at an Apple Store or Apple Service Provider, see this article for steps on how to make a live appointment.