This error usually points to issues with the Dual SIM setup, often related to conflicts between the eSIM and physical SIM, especially after iOS updates. Another common cause is bugs in iOS versions, making the phone struggle to decide which line to use, particularly from recent calls. Additionally, it can happen due to network or carrier settings not being updated correctly.
Basic Troubleshooting
Before diving into detailed solutions, let’s start with some basic troubleshooting:
Turn on airplane mode for 30 seconds, then turn it off.Ensure the SIM you’re using has a strong signal to prevent the iPhone from automatically selecting another network.
If these steps don’t resolve the issue, consider the following detailed fixes:
1. Manually Change to the Other Phone Line
When the iPhone can’t use the main line due to a connection or setup problem, choosing the other line makes sure the call goes through. This forces the phone to switch to the available network, letting you make calls without depending on automatic line selection. If you continue to face this error even after pressing the Call option, you’ll need to change to the remaining line on your phone manually. There are two ways to do this. When you dial a number on your iPhone, you’ll see an option at the top of your screen showing the current line selected. Tap on this option, select the other line, and dial the number to switch to this line manually. If you dial the number through the Contacts app, tap the option next to “Default” under their name. This is the Preferred Line option and it allows you to choose a specific line to call the person with. If you continue to face this error after trying this solution or do not want to use the other line on your phone, continue with the solutions we’ve listed below.
2. Clear Recent Call Logs
Clearing the recent call logs resets the phone’s memory of which line it used for past calls. When the iPhone tries to auto-dial from the last-used line, old call data can cause issues, especially with Dual SIMs. By erasing the call history, you remove any outdated info that might be causing problems, letting the system work correctly with the available line.
3. Turn off Wi-Fi Calling
Wi-Fi Calling can interfere with how your iPhone handles network connections for calls, especially in a Dual SIM setup. When enabled, the device may switch between Wi-Fi and cellular networks during a call, leading to confusion about which line should be used. Turning off Wi-Fi Calling forces the phone to rely solely on cellular networks, which can prevent this issue by ensuring a more stable connection and clearer line assignment.
4. Disable Automatic Network Selection
When automatic selection is on, your device might try to switch between carriers or networks, causing the “Last Line No Longer Available” error. By manually choosing a network, you stop the device from defaulting to an unavailable or weaker line.
5. Reset Network Settings
Resetting the network settings gives your iPhone’s connections a fresh start. It clears all saved data like Wi-Fi networks, Bluetooth pairings, and cellular settings, especially those affecting Dual SIMs, which might cause the “Last Line No Longer Available” issue. This helps the device reconnect to networks and carriers with clean settings, often fixing connection problems that have built up over time.
