When attempting to make a call on an iPhone with an eSIM,
users may encounter an error that states "last line no longer
available." So, what does this all mean, and what can be done about it?
What Does "Last Line No Longer Available" Mean?
On an iPhone with dual-SIM functionality, this error appears
to affect the preferred line. You may encounter the issue if you have more than
one cellular plan linked to your iPhone via a standard SIM and an eSIM.
When attempting to dial out from the "default" SIM using the recent call log under Phone > Recent, the error appears most frequently. You'll see an error message that gives you the option of calling using your "remaining" line. You can call from any number that isn't set as your default by tapping "Call" in the box that appears.
Some Possible Solutions
We were unable to reproduce the error because your iPhone
does not support more than one SIM card. This makes testing potential fixes
difficult.
That said, there are a variety of potential fixes available,
the majority of which are anecdotal, with stories of "this worked for
me" attached. So your mileage may vary, but if you see this error
frequently, you'll most likely have plenty of opportunities to test out these
solutions.
The first is self-explanatory: make sure you're running the
most recent version of iOS. Errors like this are frequently associated with
bugs, so updating your iPhone via Settings > General > Software Update
will eliminate a potentially large variable. You can also attempt to update
your available carrier settings by going to Settings > General > About
and selecting "Update" when prompted.
Another common and simple solution is to enable Airplane
mode in Control Center and restart your iPhone. Both of these will cause your
network connection to be reset, which may resolve the problem. You can also
experiment with switching between SIM cards before dialing in the Settings >
Mobile/Cellular Data menu by tapping "Turn On This Line" next to the
plan you want to use.
A similar solution is to remove and reinstall your SIM card.
On an iPhone, you can do this with a SIM tool or any thin pointy object, such
as a paperclip.
Some users reported that enabling (or disabling, then
re-enabling) Wi-Fi calling resolved the problem. To do so, navigate to Settings
> Mobile/Cellular Data and toggle the Wi-Fi Calling setting. Others have
reported success after clearing their recent call log under Phone > Recents
by tapping Edit, Clear, then "Clear All Recents" in the pop-up that
appears.
Finally, if you're still having trouble, you can reset your
iPhone's network settings by going to Settings > General > Transfer or
Reset iPhone and tapping "Reset" followed by "Reset Network
Settings." All cellular settings, VPN and APN settings, and Wi-Fi
credentials will be reset to factory defaults.
