If your iPhone shows the error “Last Line No Longer Available” when making outgoing calls from the contacts list, recent calls, or keypad, it usually means your default voice line is inactive, has no signal, or your dual SIM settings are misconfigured. This problem is common on iPhones using Jio, Airtel, or Vi with dual SIM (eSIM + physical SIM). The good news is you can fix it in a few minutes by changing the correct calling line and resetting the network settings.
[Check iPhone Call Failed Error – Full Fix Guide]
Method 1: Change Default Voice Line (Most Important Fix)
Open Settings on your iPhone,
Tap Cellular / Mobile Data,
Tap Default Voice Line,
Select the SIM that has network signal and active plan,
Go back and try making an outgoing call again.
Method 2: Turn Off the Unused SIM Line
If you don’t use the second number,
Open Settings,
Tap Cellular / Mobile Data,
Select the unused line,
Turn Turn On This Line → OFF,
Restart your iPhone and test calling from contacts.
Method 3: Select Line Manually While Calling
Open the Phone app,
Tap Keypad,
At the top of the screen tap the SIM/Line name,
Choose the active SIM,
Dial the number again.
This helps when the error appears only for outgoing calls from the contacts list.
Method 4: Clear Recent Calls (Fixes Contact Calling Bug)
Open Phone app,
Go to Recents,
Tap Edit,
Tap Clear → Clear All Recents,
Restart the iPhone and call again from the contacts list.
Method 5: Reset Network Settings
If the problem still continues,
Open Settings,
Tap General,
Tap Transfer or Reset iPhone,
Tap Reset,
Select Reset Network Settings,
Enter passcode and confirm,
After restart connect to mobile network and test outgoing calling.
This removes old carrier settings that cause the line not available error.
Method 6: Disable Cellular Data Switching
Open Settings,
Tap Cellular / Mobile Data,
Tap Cellular Data,
Select your primary SIM,
Turn Allow Cellular Data Switching → OFF,
Restart the iPhone.
This is very effective for dual SIM users in India.
Method 7: Update Carrier Settings
Go to Settings → General → About,
Wait for the Carrier Update popup,
Tap Update if available.
This fixes calling issues with Jio, Airtel, and Vi.
Common Problems & Quick Fix
Error only when calling from contacts → Change default voice line.
Error only on one SIM → Turn off unused line.
Outgoing calls failing → Reset network settings.
Dual SIM users → Disable cellular data switching.
Conclusion
The “Last Line No Longer Available” error happens because the iPhone tries to call using an inactive or no-signal SIM. Setting the correct default voice line, turning off the unused SIM, and resetting network settings will permanently fix outgoing calling from contacts, recents, and keypad. After applying these methods, your iPhone will use the active SIM automatically and the error will not appear again.
FAQ
Why does this error appear on iPhone?
It appears when the selected default calling line has no signal, no balance, or is turned off.
Does this happen only on dual SIM iPhones?
Mostly yes, but it can also happen after switching eSIM or carrier settings.
Will resetting network settings delete my data?
No, it only removes saved WiFi passwords and network configurations.
Which method works best for India users?
Changing the Default Voice Line and turning off Cellular Data Switching works best for Jio, Airtel, and Vi.
