How To Fix Last Line No Longer Available Error

If your iPhone has dual-SIM or eSIM functionality, you might have encountered the “Last Line No Longer Available” error when trying to make a call.

This pop-up message might also suggest calling using the other phone line supported by your phone. It seems that this problem primarily occurs with iPhones running on iOS 15.5, which indicates that it’s a bug that is yet to be sorted by the developers.

But because many users complained online about this problem, a few effective solutions were established. Which fix will work on your phone depends, as there’s no straightforward explanation why this message appears and what definitively prevents it.

Solution 1 – Turn On/Off Airplane Mode

Network-related issues are tricky, and sometimes a surprising action fixes the problem. If you’re seeing the “Last Line No Longer Available” message, tap the airplane mode button on your iPhone. Here’s how.

1. Access the Control Center by swiping down from the top of the home screen.
   
2. Turn on Airplane mode.
   
3. After several seconds, turn off Airplane mode.
   

Once you’ve done this, try calling a number from your preferred line again. Hopefully, it works.

Solution 2 – Clear the Recent Call Log

Some iPhone users have noticed that the “Last Line No Longer Available” error only appears when they place a call from the recent call log list.

Therefore, one of the solutions is to erase the call log list and start anew. To give this fix a try, follow the steps below.

1. Open the “Phone” app in “Settings” and move to the “Recents” tab.
   
2. Select the “Edit” button in the top-right corner of the screen.
   
3. Select “Clear” followed by “Clear All” to confirm.
   

Once the call log is cleared, restart your iPhone. This allows the device to purge running apps and clear RAM giving you a clean slate.

Solution 3 – Hard Reset Your iPhone

Hard reset or force reset completely flushes the cache memory and deletes multiple temporary files. Often, the hard reset is precisely what resolves network issues, so it’s practical to know how it works.

Since the “Last Line No Longer Available” is a problem that only occurs on newer iPhone models, we’ll list the hard reset steps that apply.

1. Press the “Volume up” button and release.
   
2. Press the “Volume down” button quickly after and release.
   
3. Continuously press the “Power” button until the Apple logo appears on the screen.
   

If you don’t see the logo, it probably means you didn’t react quickly enough, so try again.

Solution 4 – Change the Phone Line

Because the “Last Line No Longer Available” error is a network-related issue, switching from one SIM to another might be a good idea.

This is more likely to work if each SIM is from a different carrier, though. If dialing from the default SIM is triggering this pop-up message, then try switching to the other SIM.

These steps show you how to make this switch.

1. Select the contact you want to call.
   
2. Next to their name, tap the “i” symbol.
   
3. Select the alternate number.
   

If it doesn’t work and you’re still seeing the dreaded error, move on to another potential solution.

Solution 5 – Update Carrier Settings

Carriers frequently issue updates that ensure better cellular network performance and resolve existing bugs. If it has been a while since you’ve updated carrier settings, it might be what’s causing the “Last Line Not Available” error. Fortunately, this is an easy fix, and all you have to do is follow the steps below.

1. On your iPhone, go to “Settings” and select “General.”
   
2. Tap “About.”
   
3. If there’s an update available, you’ll receive a pop-up message prompting you to update.
4. Tap “Update” and allow the update to complete.

If there was an update waiting for you, the latest version of the carrier settings likely resolved the problem.

Solution 6 – Disable Wi-Fi Calling

Wi-Fi calling is an incredibly handy feature available on iPhone 6 and later and allows you to receive calls and texts via Wi-Fi when your phone is out of range. While super practical, this functionality can sometimes cause network issues.

It may also lead to the “Last Line No Longer Available” error on the screen when you’re trying to call a contact from the default SIM card. To test whether this feature is causing the problem, it’s best to disable it.

It’s a pretty straightforward process.

1. On your iPhone, go to “Settings” and select “Phone.”
   
2. Under the “Calls” section, select “Wi-Fi Calling.”
   
3. Move the toggle from “On” to “Off.”
   

Another way to change this setting is to go to follow these steps.

1. Go to “Settings,” followed by “Cellular.”
   
2. Tap “Wi-Fi Calling.”
   
3. Slide the toggle from “On” to “Off.”
   

If Wi-Fi calling was causing the unfortunate error message, disabling it should resolve the issue.

Troubleshooting iPhone Dual-SIM Functionality

You can have two phone lines without carrying two phones with dual-SIM functionality. That’s a fantastic option for those who want to keep their private and work lives separate without spending a fortune on another iPhone.

While this is a handy feature, it seems to cause some calling issues, preventing users from relying on the default SIM card. It might not happen every time but may be frequent enough to cause significant inconvenience.

Make sure to try some of the fixes listed above, and hopefully one will prevent the “Last Line No Longer Available” message from appearing again.

How often have you gotten this error message? Were you able to solve the issue? Let us know in the comments section below.