- To fix Last Line No Longer Available, try clearing your recent calls by going to "Recents" > "Edit" > "Clear."
- If you have a physical SIM, remove and reinsert it to refresh it.
- Try toggling your SIM cards off and on in your iPhone Settings to fix this dual-SIM error.
Clear your recent calls.
Deleting your recent calls can help. Many users have said clearing the recent call list fixes the "Last Line No Longer Available" error on the iPhone. Simply open your Phone app, tap Recents, and tap Edit in the upper right-hand corner. Then, tap Clear in the upper-left corner and select Clear All Recents. After clearing your recent calls, check to see if you still get the "Last Line No Longer Available" error.
Switch lines.
Manually switch to your secondary line. If your second line has a valid phone number with a cellular plan, you can use that line instead of your primary line. While this isn't a fix for the issue, it is a workaround if you have a valid secondary phone number. When you get the "Last Line No Longer Available" error, tap the Call button to use your secondary line instead of your primary.
Restart your iPhone.
A quick reset can fix issues with your SIM or eSIM. Press and hold the side button and volume up button for a few seconds, then power down your phone. Once it's shut down, turn it right back on. Restarting your iPhone clears up many seemingly random issues. Check to see if you still get the "Last Line No Longer Available" error.
Update your iPhone.
Check to see if your phone needs an update. Outdated iOS software can lead to your iPhone not working properly, including issues with your dual-SIM. Tap on your Settings app (which is gray and looks like a set of cogwheels), then tap General > Software Update. If there is a pending update, follow the on-screen instructions to download and install it. Note that updating your phone may take some time, during which time your phone may be unusable. After the update completes, check to see if you still get the "Last Line No Longer Available" error.
Turn off Wi-Fi calling.
A weak Wi-Fi signal can interfere with this feature. Wi-Fi calling is a setting that allows you to make phone calls on Wi-Fi when your cellular signal is poor. However, if you are connected to a weak Wi-Fi signal or aren't connected to Wi-Fi at all, there may be some interference with Wi-Fi calling that could be causing your call to fail. Go to Settings > Phone and select the Wi-Fi Calling option under the "Calls" heading. If Wi-Fi calling is toggled on, tap the toggle to turn it off. Check to see if you still get the "Last Line No Longer Available" error.
Toggle both SIMs on and off.
Turn your primary and secondary SIM off and back on. Toggling your SIM cards on and off can have a similar effect as turning your phone on and off and can help clear out the "Last Line No Longer Available" error. Navigate to Settings > Cellular > Default Voice Line and toggle your primary and secondary SIM/eSIM off and back on.
Reinsert your SIM card.
Remove your physical SIM card for a few seconds. If you have a physical SIM, removing the SIM card and putting it back in can help refresh any SIM-related phone line errors. You can open the SIM tray using a paperclip or SIM eject tool. The SIM tray is located on the left side of your phone. Remove the SIM card and place it back in the tray, ensuring it's placed correctly, before reinserting it. You may not have a physical SIM with your iPhone. If you open the SIM tray and don't see a SIM card, check under Settings > General > About and scroll until you see information about your SIM. If you see a heading that says "eSIM" and no heading about "physical SIM," then you must contact your carrier for eSIM assistance. Restart your phone after reinserting your SIM card to see if you still get the "Last Line No Longer Available" error.
Check for carrier settings updates.
Your carrier may have issued a fix via an update. If you're having issues with cellular-related activities on your phone and keep getting the last line error, first connect your phone to Wi-Fi if it isn't already. You can manually try updating your carrier settings while connected to Wi-Fi to fix the issue. Go to Settings > General and tap About. Look for a carrier settings update prompt. If you have a carrier settings update, you will be prompted to update. If you don't see a prompt, your device is updated to the latest carrier settings.
Enable Automatic Network Selection.
Check Automatic Network Selection, if you have the option. While not every iPhone has the Automatic Network Selection option, it can help fix last line errors if you're on a weak or congested cellular network. Simply go to Settings > Cellular and select Automatic under "Network Selection." You may or may not have this option in your settings.
Reset your network settings.
Try fully resetting your phone's network settings. If nothing else works, try resetting your network settings. This will reset your phone's network settings to the factory settings, and, as such, erase any Wi-Fi networks and passwords, custom cellular settings, and any VPN or APN settings. Go to Settings > General. On iOS 14 and earlier, select Reset and on iOS 15 or later, select Transfer or Reset [device] > Reset. Then, select Reset Network Settings and follow the on-screen instructions. Once your phone restarts, check if you still get the "Last Line No Longer Available" error.
Contact your carrier.
If nothing else works, your mobile provider can help. You can log into your account with your carrier to contact them, go to a physical carrier location, or call them from another device. Below are a few of the top carriers in the US and their contact pages: Verizon T-Mobile AT&T Boost Mobile Tracfone Mint Mobile
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