sim failure

Top 3 Ways to Fix Sim Failure iPhone Issue

Sim failure is a frustrating issue that affects all iPhone models. The issue is quite problematic since you can’t make phone calls, send or receive texts, or connect to the internet if you have a mobile data plan. Fortunately, you can troubleshoot and resolve the issue all by yourself in just a few minutes.

In this post, we look at how to fix sim failure iPhone issues, including how to determine the cause of iPhone sim failure.

Part 1. The Causes of iPhone Sim Failure

There is no specific cause for iPhone sim card failure meaning the issue can be either hardware or software related. Regardless of which model of iPhone you have, here are some of the most common causes of iPhone sim failure:

  • Sim card tray: Your sim card connects to your phone through the sim tray, and if it’s not connected correctly, it won’t work.
  • Damaged sim card: If your sim card is damaged, it won’t be detected properly, which activates the sim failure notification.
  • System malfunction: In some cases, the issue is not the sim card but the iPhone’s system itself. The system fails to detect the system even if it’s working properly.
  • Problematic software update: Though iOS updates are supposed to improve the system, they tend to be glitchy with a few bugs, especially first releases. These glitches can 47lead to sim card failure.
  • Active plan: Sometimes, you might forget to check your plan, which is necessary for the sim card to work. If you don’t have an active plan, your wireless carrier might block your sim from their services.

Part 2. Basic Ways To Fix Sim Failure on iPhone

As seen in Part one, there are several reasons why your sim card isn’t working on your iPhone. Because it’s an issue that requires immediate attention, here are some basic ways to fix sim failure on iPhone.

2.1 Reinsert the SIM card

2.2 Turn Airplane Mode On and Off

2.3 Reset Network Settings

2.4 Update Carrier Settings

2.5 Contact The Carrier

2.6 Try Another SIM card

2.1 Reinsert the Sim Card

The most common reason behind sim failure is inserting the card incorrectly. If your iPhone has a sim card tray, you can try to remove the sim card and insert it back correctly. Here is how you can reinsert the sim card.

  • 1Locate the sim card tray, which can be found on either the left or right side of your iPhone, depending on the model.
  • 2Look for a small hole beside the sim tray where you can insert the sim ejector tool or a paperclip to open the tray.
  • 3Remove the sim card and check for any damage. If there is none, clean the card gently with a dry and soft cloth.
  • 4Place the sim card on the tray and push the tray back into your iPhone.

2.2 Turn Airplane Mode On and Off

Sometimes all you have to do is switch off your cellular network through airplane mode. Turning the airplane mode on and off refreshes the cellular network and helps your phone recognize the sim card. Follow these steps to turn airplane mode on and off:

  • 1Swipe up from the bottom of your screen to access the notification panel
  • 2In the upper-left corner is an icon with a white airplane in the middle of a circle. This is the Airplane Mode icon.
  • 3Tap on the icon to turn on Airplane Mode, which will turn the icon to orange. Once you turn it off by tapping the icon again, the background becomes transparent.

2.3 Reset Network Settings

If none of the solutions above work, you can reset your current network settings but ensure you have backed up any important Wi-Fi passwords. You will also have to pair your phone with other wireless devices, such as Bluetooth speakers. Here is how you can reset your iPhone’s network settings.

  • 1Navigate to Settings > General > Transfer or Reset iPhone > Reset > Reset Network Settings
  • 2Enter your password
  • 3Tap Reset all settings to confirm your action

2.4 Update Carrier Settings

Your cellular network service provider might have released a new update which can result in issues for outdated phones. In most cases, the phone will update automatically. Manually updating your carrier settings can help resolve the issue by ensuring your iPhone communicates and operates efficiently with your network. Follow these steps to complete a manual carrier settings update.

  • 1Go to Settings and tap on General
  • 2Open the About tab and scroll down to the carrier
  • 3If there is an update, you’ll see an option allowing you to do so next to Carrier

2.5 Contact the Carrier

If all these solutions are not solving the issue, you should consider contacting your carrier network, service provider. Inquire if the network is experiencing downtime or request a sim card replacement.

2.6 Try Another Sim Card

It is possible that your sim card might have some damage. If you have an extra sim card, you can insert it into your phone to check if it gets detected. If it does, your sim card has an issue, and you should contact your carrier provider for a new one.

Part 3. Practical Fixes for Sim Card Not Working on iPhone

If you try another sim card or all the solutions above and you are still getting the sim failure notification, your phone might be the problem. Here are some practical fixes for the sim card not working on iPhone.

3.1 Force Restart Your iPhone

3.2 Update Your iPhone to the Latest Version

3.3 iPhone Hardware Damage

3.1 Force Restart Your iPhone

If you have traveled internationally, there are high chances you might get the notification. To resolve the issue, force restart your iPhone to refresh the system. Here is how you can force restart different iPhone models.

  • iPhone X and later: Press and hold the volume down button together with the side button until the power off slider appears. Drag the slider and wait for your iPhone to restart.
  • Other iPhone models: Press and hold the side/power button until the power off slider appears. Drag the slider and wait for the phone to restart.

3.2 Update Your iPhone To the Latest Version

It is common for the first release to be full of glitches and bugs, so ensure you update your iPhone to the latest version. Apple releases updates to solve some of the issues affecting their operating system, which includes sim card failure. To update your iPhone to the latest version, navigate to Settings > General > Software Update

3.3 iPhone Hardware Damage (Contact Apple Tech Support)

In the worst-case scenario, your phone might have a hardware problem that requires the attention of Apple technicians. Before visiting the service center, contact Apple Support and clearly define the sim card failure issue, including some of the fixes you have tried. The technician will run a diagnosis and fix the issue.


Sim failure on your iPhone is a problematic issue that requires immediate attention since you’ll be unable to dial or receive phone calls and text messages. Fortunately, by following this guide, you can resolve the issue in a few minutes, especially if you use the UnicTool Umendit software.

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