Facing a “SIM Failure” message on your iPhone can be frustrating, cutting you off from calls, texts, and data. But don’t panic! This guide offers a comprehensive approach to diagnosing and fixing the issue, from quick basic fixes to advanced troubleshooting.

Why Your iPhone Says SIM Failure?

Several factors can trigger this message, ranging from software glitches to SIM card issues:

  • Software issues: Faulty software updates, network settings glitches, or incompatible carrier updates can lead to miscommunication between your iPhone and the SIM card.
  • Physical issues: Damaged SIM cards, dust in the SIM tray, or a faulty SIM tray itself can also disrupt proper reading.
  • Carrier issues: Network outages, account problems, or incorrect SIM provisioning from your carrier can also be culprits.

Common Scenarios

  • You see “No SIM card installed” or “Invalid SIM” message.
  • You can’t make or receive calls, texts, or use mobile data.
  • Airplane mode toggle doesn’t resolve the issue.

6 Basic Fixes for SIM Failure on iPhone

Let’s get to know about the common fixes for SIM Failure on iPhone

Reinsert the SIM Card

Power off your iPhone, eject the SIM tray, clean the card and tray with a soft cloth, reinsert the card ensuring proper placement, and restart your phone.

Turn On and Off Airplane Mode

This quick refresh can sometimes reset the network connection. So, toggle on and off the Airplane mode to fix the error.

Reset Network Settings

This erases all Wi-Fi and cellular network settings, requiring you to re-enter your passwords, but can resolve configuration issues. So, get to Setting, Reset Network, and wait for the changes to take place.

Update Carrier Settings

Your carrier may push periodic updates to optimize network performance. Check Settings > General > About and install any available updates.

Try a different SIM card

Borrow a compatible SIM card from another phone or visit your carrier for a replacement to test if the issue lies with your specific card.

Contact the Carrier

Explain the issue and check for network outages, account problems, or SIM card issues your carrier can address.

3 Advanced Fixes for SIM Card Not Working on iPhone

Here are the advanced fixes that you can try in case the basic ones fail to resolve the error on your iPhone:

Force Restart Your iPhone

The specific method varies depending on your model but generally involves holding down power and volume buttons in a specific combination. This can force-quit any malfunctioning processes.

Update to the Latest iOS Version

Outdated software can harbor bugs that affect network connectivity. Install the latest iOS update through Settings > General > Software Update.

Check for Physical Damage

Look for cracks, scratches, or water damage on the SIM card or SIM tray. If you suspect damage, visit your carrier for a replacement.

Using Tools to Fix SIM Failure on iPhone

While not always necessary, some third-party tools can help:

Phone Unlocking Software

These tools can potentially unlock SIM cards locked to specific carriers, but use them with caution as they may violate carrier agreements.

iOS System Repair Tools

These tools aim to fix various iOS system issues, including network connectivity problems. Research reputable options and proceed with caution as they may alter your device’s software significantly.


By systematically trying these fixes, you’ll likely resolve your iPhone’s SIM failure issue. Start with the basics, escalate to advanced methods if needed, and consider your comfort level with using additional tools. 

If none of these suggestions work, contacting Apple Support or visiting an authorized service center for further diagnosis might be necessary. Remember, staying calm and trying solutions methodically will get you back to enjoying your iPhone’s full functionality quickly.