Below, we’ll briefly discuss what this error means, why it shows up on your iPhone, and teach you everything you can do to get rid of it. So, let’s get started, shall we?
What Does the “Last Line No Longer Available” Error on iPhone Mean?
An iPhone on a Dual SIM setup can display a “Last Line No Longer Available” error when it has trouble detecting the default or preferred line while attempting to make a phone call. It mainly appears on the various iPhone 13 models but can also be a problem on other Dual SIM-supported iPhone models.
The underlying reason is some random bug or glitch with the cellular radio, a corrupt call log, or an incorrectly configured network setting. You can still use your other number, but that’s not always practical.
Usually, fixes like toggling Airplane Mode on and off, restarting your iPhone, or clearing your “Recents” history help resolve the issue. However, you may have to resort to performing a carrier settings update or a network reset if none of the more straightforward fixes help.
Let’s go through each possible way to fix the “Last Line No Longer Available” iPhone error.
1. Switch Phone Lines Manually on iPhone
Tapping the Call option on the “Last Line No Longer Available” pop-up automatically puts the call through the other line on your iPhone. If that doesn’t work as well, try switching numbers manually.
While dialing a new number, tap the current line at the top of the screen and pick the other line. While placing a call from the “Favorites” and “Recents” lists, tap the Info button and choose the number you want.
If you do not want to use the alternative line on your iPhone, continue with the potential fixes below.
2. Toggle Airplane Mode On and Off on iPhone
Enabling and disabling Airplane Mode is a quick fix for most cellular connectivity issues on the iPhone. Just bring up the Control Center (swipe down from the top-right of the screen or double-click the Home button) and tap the Airplane Mode icon. After waiting 10 seconds, tap the icon once more.
3. Restart Your iPhone
Another quick way to fix the “Last Line No Longer” available error requires that you reboot your iPhone. Since iOS does not feature a “Restart” option, you must turn off the device and manually boot it back up.
To do that, open the Settings app, and go to General > Shut Down. Then, swipe the Power icon to the right, wait until the screen goes fully dark, and hold the Side button until you see the Apple logo.
4. Clear Your iPhone’s Call History
If the “Last Line No Longer Available” iPhone error occurs while dialing a contact or number on your “Recents” list, delete the call entries associated with the number and try again. To do that:
Open the Phone app and switch to the Recents tab. Tap Edit. Tap the Delete icon next to each entry related to the contact or number.
Delete the entire call log if the error occurs for every number on your iPhone’s “Recents” list. To do that:
Open the Phone app, switch to the Recents tab, and tap Edit. Tap Clear. Tap Clear All Recents.
5. Update the Carrier Settings on iPhone
Check if your iPhone has a pending carrier update. To do that, open the Settings app and tap General > About. Then, scroll down to the Carrier section and wait for up to a minute. If you get a “Carrier Update Available” prompt, tap Update to install it.
6. Avoid Using Your Preferred Line for Cellular Data
The “Last Line No Longer Available” error can also show up on your iPhone if you use your default or preferred line to access cellular data. You can change that by following these steps:
Open the Settings app and tap Cellular. Tap Cellular Data. Select the other phone line or Off to disable cellular data altogether.
You may also want to try experimenting by setting the Allow Cellular Data Switching option to on or off.
7. Disable Automatic Network Selection on iPhone
Another reason for the “Last Line No Longer Available” iPhone error is a feature called Automatic Network Selection. It prompts your iPhone to pick the best network to establish a connection but causes issues on Dual-SIM iPhones.
To disable Automatic Network Selection, open the Settings app and tap Cellular > Network Selection. Then, turn off the switch next to Automatic Network Selection and pick your carrier network.
8. Disable Wi-Fi Calling on iPhone
Wi-Fi Calling allows you to make and receive phone calls over Wi-Fi in areas with poor cellular signal strength, but it could also create conflicts and result in the “Last Line No Longer Available” error.
To fix that, open the Settings app and tap Cellular > Wi-Fi Calling. Then, turn off the switch next to Wi-Fi Calling on This iPhone.
9. Install the Latest Software Updates
Apple regularly pushes software updates to iPhones in order to address issues like this. So, a newer software version might contain a permanent fix for the “Last Line No Longer Available” error. To check, open the Settings app and go to General > Software Update. Then, tap Download & Install to install the latest available version of iOS for your iPhone.
10. Reset Network Settings on iPhone
If none of the fixes above work, try resetting your iPhone’s network settings. To do that, open the Settings app, go to General > Transfer & Reset Phone, and tap Reset Network Settings.
A network settings reset wipes your iPhone’s cellular settings and preferences, but they should automatically update after the device reboots itself. Contact your carrier if they don’t.
Say Goodbye to the “Last Line No Longer Available” Error
Turning Airplane Mode on and off, restarting your iPhone, or clearing your “Recents” list almost always fixes the “Last Line No Longer Available” error. If not, take the time to go through the other fixes above, and it should eventually go away.
However, if the problem persists, the only remaining option is to contact your carrier or Apple Support for help. But don’t worry; they can help you in more ways than we could.
