How to Fix “Last Line No Longer Available” on iPhone
What “Last Line No Longer Available” means
You tap a contact, and instead of ringing, a pop-up stops you cold: “Last Line No Longer Available.” Your bars look fine, the other line seems okay, and the message explains nothing. So what just happened?
The message appears when your iPhone attempts to place a phone call using a cellular line that is not currently available. In practice this happens almost exclusively on Dual SIM iPhones — models with a physical SIM plus an eSIM, or two eSIMs — where the Phone app has to pick one line for every outgoing call. Sometimes it picks the wrong one: a line that is turned off, temporarily suspended by the carrier, out of signal, or stuck in a registration glitch after an iOS update or a network change.
Rather than failing silently or dropping the call halfway, iOS blocks it up front and tells you the line is no longer available. The pop-up even offers a Call button, which routes the call through your other active line — a handy clue that the problem is with line selection, not with your phone hardware.
Common causes
- Wrong line selected for the call: the Phone app tried the line you used last, but that line is currently inactive or out of range.
- A line is turned off or suspended: a plan you disabled, or one your carrier suspended for a billing or provisioning reason.
- Stale cellular registration: the iPhone’s connection to the network got out of sync — common after travel, switching carriers, or an iOS update.
- Outdated carrier settings: missing carrier bundle updates can break how the iPhone registers each line.
- iOS Dual SIM bug: Apple’s point releases have repeatedly fixed line-selection glitches, so an outdated iOS version can be the culprit.
How to fix “Last Line No Longer Available” — step by step
Work through these in order — most people are fixed by step 3 or 4.
- Try the call again and let the iPhone switch lines. When the “Last Line No Longer Available” pop-up appears, tap Call — the iPhone will usually place the call through your other line automatically. If the call goes through, the message was a one-time line-selection hiccup. If it happens every time, keep going: the underlying line problem needs a real fix.
- Switch lines manually in the Phone app. When dialing a new number, tap the line name at the top of the keypad screen and pick the line you want to call from. When calling from the Recents or Favorites list, tap the Info button (the small “i” in a circle) next to the contact and choose the line under the call buttons. Use whichever line shows full signal bars and is clearly active — then try calling again from that line.
- Toggle Airplane Mode to refresh the cellular connection. Open Settings and switch Airplane Mode on, wait about 10 seconds, then switch it off. This forces the iPhone to re-register both lines with the carrier, which clears most temporary registration glitches. Wait until both lines show signal bars again before retrying the call — rushing it while the phone is still reconnecting can trigger the same error.
- Check that both lines are turned on. Go to Settings > Cellular and tap each cellular plan to confirm “Turn On This Line” is enabled. Then go to Settings > Cellular > Default Voice Line and make sure your preferred line is selected as the default. A line that is off or suspended will trigger this message every time the Phone app tries to use it. If a line you expect to be active is missing entirely, contact your carrier — the eSIM profile may need to be reissued.
- Update carrier settings and iOS. First, connect to Wi-Fi and go to Settings > General > About — if a carrier settings update is available, a pop-up will offer to install it, and you should accept. Then go to Settings > General > Software Update and install any available iOS update. Apple regularly fixes Dual SIM calling bugs in point releases, so an update is one of the most reliable long-term fixes for this message.
- Reset Network Settings. If nothing above worked, go to Settings > General > Transfer or Reset iPhone > Reset > Reset Network Settings, enter your passcode, and confirm. This clears stuck cellular registration, saved Wi-Fi passwords, and VPN settings, giving both lines a clean start. It does not delete photos, apps, or messages — but you will need to re-enter your Wi-Fi passwords afterward. Retry the call once the phone reconnects.
Did this fix it? Quick checklist
- Tapping “Call” on the pop-up completes the call through the other line
- Both lines show “Turn On This Line” enabled under Settings > Cellular
- The preferred default voice line is set correctly
- Carrier settings and iOS are fully updated
If the error persists after all six steps, the line itself may be the problem rather than the phone: contact your carrier and ask them to check the line status, re-push the eSIM profile, or replace a failing physical SIM. If the carrier confirms both lines are healthy, book a diagnostic at Apple Support — a modem-level issue is rare but possible.
Frequently asked questions
What does “Last Line No Longer Available” mean on iPhone?
It means your iPhone tried to place a call using a cellular line that is currently unavailable — usually a Dual SIM or eSIM line that is inactive, has no signal, or hit a registration glitch. The phone blocks the call rather than silently failing.
If I tap Call on the pop-up, will my call go through?
Usually yes. The pop-up offers a Call button that routes the call through your other active line. If that line works, the call completes normally — this also confirms the original line was the problem.
Does Reset Network Settings delete my data?
No — it does not touch photos, apps, contacts, or messages. It erases saved Wi-Fi passwords, VPN configurations, Bluetooth pairings, and cellular registration data, so you will need to re-enter Wi-Fi passwords afterward.
Why does this error mostly happen on Dual SIM iPhones?
Because the Phone app has to pick a line for each call. On a single-SIM iPhone there is only one choice; on Dual SIM or eSIM iPhones the app can grab the wrong line — one that is off, suspended, or briefly unregistered — and this message is the result.