How to fix “no sim card installed” error on iphone 6

Issue

iPhone 6 error message “No SIM Card Installed”. iPhone 6 says No Sim despite having a SIM card inside. iPhone 6 won’t detect SIM Card placed inside. Getting No Sim error on iPhone 6 or 6 plus.

Solution

If you get a pop-up on your iPhone 6 telling you No SIM card is installed, or you see No SIM in the top left corner instead of your signal, this can be caused by either a software or hardware issue. Here are some steps you can take to try to solve this problem:

• Is this an iPhone you recently purchased? If yes, make sure it was not blacklisted or that it was successfully unlocked if it didn’t originally belong to your Carrier
  • Here are some tools you can use to verify if a used iPhone is okay to purchase:
    iCloud Activation Lock checker: https://www.icloud.com/activationlock/
    Apple Serial Number checker: https://checkcoverage.apple.com/
• If your iPhone was not recently purchased or this is a recent issue, try a SIM pull
• 
• • Power off your iPhone
  • Remove your SIM card from the iPhone
  • With a dry cloth wipe the SIM card clean and blow into the SIM slot to clear any dust
  • Re-insert the SIM card and power on your iPhone and test
  • If issue persists proceed to the next step
• Go to Settings > General > Reset and select Reset Network Settings
  
• 
• Note: This will erase any saved WiFi connections, you must reconnect to WiFi after this step
  
• • Your iPhone will show the Apple logo and restart
  • Once your iPhone is back on, see if it’s still giving you the No SIM error message
• Verify if your iPhone is up to date
• • Go to Settings > General > Software Update 
  • 
  • If there is an update available then make sure to download it
  • If none of the above worked, then it is likely caused by a hardware issue in this case. Consider having your iPhone replaced or repaired through Apple.

Source: thecellguide

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