6 Ways to ‘Fix Last Line No Longer Available’ on iPhone 13

New iPhone 13 owners have reported that the device ends with “Last Line No Longer Available” on the screen. Apple has addressed the iOS 15 issue many months back, and the device owners don’t know about it. We are here to fill the gap and show you how to resolve the problem in the latest iPhone 13 or older devices.

What causes “Last Line No Longer Available” on iPhone 13?

iPhone 13, 13 Pro, and 13 Pro Max are the latest edition from Apple. The company introduced newer hardware and features in the 13th series. The latest software and hardware have shortcomings, and the Cupertino-based company does what it takes to fix the problems. Let us look at some of the contributing factors that caused the “Last Line No Longer Available” error in the iPhone 13 series.

Dual-SIM Technology:

Apple took a long time to introduce Dual-SIM technology in the iPhones. They have set some rules in the Phone app, and one of the rules is causing the problem. The user tries to make the call from the default line, and the Phone app informs us of an error.
The iPhone wants to know your primary choice of communication line. You select one network from the Dual-SIM. The Phone app is having issues calling a contact from the default line. That triggers the “Last Line No Longer Available. Do you want to call using your remaining line” error.

iOS Bugs:

Apple releases new iOS software each year. It welcomes a few drawbacks. You can take any operating system in the world and how much time it takes to stabilize the software. You have to wait for the company to address the issue and release an update to resolve the iOS-related problems. Meanwhile, I have shown you a solution below, and you can check it out to resolve iOS issues.

Phone App Issues:

It’s rare for the Phone app to have issues in it. Fortunately, you can apply the solution to resolve the Phone app issues, and I have shown it below. You will lose call logs or call history data in the iPhone, so you should note down the numbers from the history.

Outdated Carrier Settings:

iPhone and Dual-SIM is a long-awaited feature for Apple users. The Dual-SIM integration requires support from the carrier’s end. There is no doubt that the telecommunication companies have prepared themselves for the new change. You have to update the carrier settings in the iPhone, and I have shown you how to do it below.

Outdated SIM Card:

My SIM Card has aged well, and the carrier started informing the users to get a new card. There is a way to find out about the SIM card status, and I have shown you below. Don’t panic if the carrier has stopped or planning to stop the services in the distant future. Carrier has laid down a few alternatives for you, or you can switch to another network.

How to fix “Last Line No Longer Available” on iPhone 13 or earlier devices?

I’m imploring the users to create a full device backup in the local machine such as Windows or macOS. You can put the iCloud to work and back up the device data, but you should check the cloud storage to avoid problems. Meanwhile, there is a risk of losing saved data in the iPhone, and that’s why I’m asking you to create a backup.

Restart iPhone 13 or Earlier Device

Your iPhone or any smartphone in the world doesn’t see a good night’s sleep. My iPhone has been running for weeks without sleep time, and the story is the same for the Android phone and Android tablet. You should let the device sleep once in a while for optimal performance, and it allows the software to restart the services and drivers. My words may sound like the so-last season, but it is indeed true that machines need rest.

Anyone can use the Sleep/Wake or the Side button to turn off and turn on the device. There is a method to turn off and turn on the device without a working Side button.

1. Open the “Settings” app.

2. Choose “General” from the settings.

3. Swipe down. Tap the “Shut Down” button.

4. Swipe the button to the right side to turn off the iPhone.

5. Connect the lighting cable to the iPhone and power it up.

6. Your iPhone turns on automatically.

Apple designed the iPhone to turn on when connected to the charging brick. You can use the trick to turn on any iPhone without the Side or Sleep/Wake button.

Fix Security Loopholes

We shouldn’t take the security vulnerability lightly, and iPhone is no exception. It’s a myth that iOS software is immune to viruses and malware. Go to Google News, and find reports about the new iOS malware or virus. Don’t underestimate the virus and malware because they ruin the software experience.

1. Open the “Settings” app from the Home Screen.

2. Tap “General” from the settings.

3. Tap the “Software Update” option.

4. Let iPhone connect with the Apple servers and fetch information.

Note: Make sure to read the update notes in the newer iOS software.

5. Tap the “Download & Install” button.

You should go through software update reviews online, and you will find videos, written articles, and short videos on it. Much newer iOS software has created problems in the older devices, so read some reviews beforehand.

Clear Call History

iPhone users shared information that clearing the call history solved ‘‘Last Line No Longer Available’ in the device. You will lose call history from the iPhone, so make sure to note down the numbers on the desktop or some other app.

1. Open the “Phone app from the dock.

2. Choose “Recents” from the bottom menu.

3. Tap the “Edit” button from the top right corner.

4. Tap the “Clear” button at the top left corner.

5. A pop-up box shows up, and tap the “Clear All Recents” button.

Close the Phone app from the background, then restart the iPhone to end the session. The iOS software loads the services and drivers again resolving the “Last Line No Longer Available” problem.

Try Airplane Mode

It may sound ridiculous to some readers, but airplane mode resolves most of the network-related problems in the iOS device. Airplane mode turns off all communication lines, including Wi-Fi, network, Bluetooth, mobile data, etc. You are losing anything by turning on the airplane mode for a few moments.
You can turn on airplane mode from the control center or settings. The method requires the users to turn on the flight mode for a few seconds, and you can turn off the feature after thirty seconds later. You don’t have to restart the iPhone after applying the solution.

Outdated SIM Card

My network started to send me new messages every day and make automated calls. The network is wrapping up the old technology since the world is shifting towards the 5G connectivity. The SIM card installed in the device dates back to the 3G network era, and it’s time to move on. You have to find if the carrier has stopped or decided to support the older generation SIM cards. Contact the customer care from the default number, and ask them for further instructions.

Update Carrier Settings

The mobile network has leaped in the past three decades. We have faster download & upload internet speeds comparable to the LAN connections. The telecommunication companies have to keep up with the developing technology, so the company asks you to update the network configuration. You don’t have to meddle in the updating process, but sometimes, you have to take things into your hands.

1. Open the “Settings” app.

2. Choose “General” from the settings.

3. Tap the “About” option.

4. Swipe down.

5. Tap carrier name, then update the carrier settings.

You have the latest network configuration in the iPhone. Contact carrier customer care if you feel like the process was unsuccessful.

Force Restart iPhone

Apple made computers, and they know the value of the force restart sequence. You can force restart an iPhone, and I revived iPhone 6 Plus that appeared to be dead. Let me show you to force restart any iPhone released to date.

iPhone 6S or earlier devices including SE (1st gen):

1. You have to press and hold the Sleep/Wake button and the Home button together.

2. Release the buttons when the Apple logo appears on the screen.

I’m not sure if it works with the iPhone 4 or earlier versions. However, I didn’t confirm it since they are outdated and no longer available in the market.

Force Restart iPhone 7 Series:

1. You have to press and hold the volume down button.

2. Press and hold the Sleep/Wake button.

3. Release both buttons when the Apple logo appears on the screen.

iPhone didn’t remove the Home button from the 7th series, but they added a sensor instead of a physical button.

Force Restart iPhone 8 or later devices:

You have to press and release the buttons quickly, so do not hold them unless I tell you in the tutorial.

1. Quickly press and release the ‘Volume Up’ button.

2. Quickly Press and release the ‘Volume Down’ button.

3. Press and hold the ‘Side’ button, but do not let it go until the Apple logo shows up on the screen.

The above tutorial applies to iPhone 8 to 13 series, including the SE (2nd gen). The company stopped shipping the flagship iPhones with the Home button and focused on Face ID instead. Force restart doesn’t impact the device negatively, so do not worry about the consequences.

Reset iPhone Settings

Factory reset is a well-known option that I have seen in old feature phones. iOS software resets the customized settings and restores them to the default settings.

Note: You should back the iPhone data in iCloud or a local machine through iTunes.

1. Open the “Settings” app.

2. Choose “General” from the settings.

3. Swipe down. Tap the “Transfer or Reset iPhone” button.

4. Choose the “Reset” option.

5. Choose “Reset All Settings” from the drop-up menu.

6. Enter the passcode to confirm the identity.

7. Tap “Reset All Settings” to start the process.

Let iPhone take off the resetting process and sit back until the device boots back to the Lock Screen. Plug the iPhone into the charger if it has less than 30% battery left in the tank.

Bottom Line

Approach Apple service center if the “Last Line No Longer Available” on iPhone 13 Pro Max persists. You should take the matter to the Apple engineers and let them handle the situation. Older iPhone owners who don’t have the warranty left on the device try to erase the iPhone instead. My problem was resolved after I updated the iOS software to the latest version.