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How To Fix Samsung Galaxy S4 Sim Card Not Detected Problem

A large number of Samsung Galaxy S4 owners are experiencing a problem related to sim card. The phone shows “Sim card not inserted” to the users and the phone can only make emergency calls. Here are some steps that you can follow if you have been facing this issue.

See also- How to access Recent Apps screen and Task manager on Galaxy S4

Samsung Galaxy S4 Sim Card Not Detected
Samsung Galaxy S4 Sim Card Not Detected

Potential Solutions For Samsung Galaxy S4 Sim Card Not Detected Issue


Faulty Sim card

Reinsert the Sim card after restarting your phone. Make sure that you have positioned the card properly. If you find that the problem is not solved, then try using another Sim card to test whether the Sim card is faulty or not.

The Sim card slot is either defective or dirty

The Sim card not detected problem on Samsung Galaxy S4 occurs mainly because of a hardware issue. There is a chance of one or more faulty sensors in the Sim card slot. The sensors also may become dirty. If the problem is just dirt, then take out the Sim card from the slot and blow an air into the area. It will remove the stuck dust particles from the sensors. But if you realize the sensor is defective, then get it repaired.

Your phone is locked to a specific carrier

This issue may also occur when your phone is locked to another carrier and the sim that you are using not supported by your unit. Verify it with your vendor and if the phone is locked to a specific carrier, then get it unlocked by a technician, or you can use an unlocking product available online.

Check for software problem

Sometimes the problem may occur because of some third-party apps, though according to some users this is mainly a hardware issue.  The reason is that some users found that Sim card is mounted differently on some Galaxy S4 models. However, to check if any third party app is causing the issue, boot your phone into Safe mode. For that:

  • Power off your Galaxy S4 by pressing the Power button.
  • Then turn on the phone by pressing and holding the Power key.
  • When you see the Samsung logo on the screen, press the Volume Down button and keep holding until the lock screen appears.
  • Now you should see Safe Mode written at the lower left corner of the screen.

If the phone performs well in safe mode, then any third party app is the culprit. So delete third-party apps one by one,  or perform a factory reset to fix the glitches in the system files. Steps to factory reset your phone:

  • Turn off your device first.
  • Next, hold down the Home, Power, and Volume Up buttons altogether for few seconds till Android logo appears
  • Release the buttons then. Use Volume down button for highlighting any options and Power key to confirm it. So, highlight the factory reset option and confirm it using the power button.
  • Next, select ‘delete all user data’ and confirm it.
  • Wait for few seconds to see the ‘reboot system now’ option and select it. The phone will be restarted then and you need to set it up from scratch again.

If you see that the problem stays in Safe mode, then it’s a hardware issue, so you should contactservice center or a technician or if your device is still under the warranty contact the retailer or your carrier. 

  1. This is a problem affecting a very large percentage of S4’s. There is NO fix, except for forking out $400 for a new one. Samsung will not help unless the phone is still under warranty. Yet they are aware of the problem and so is ATT (my provider). There should be a Class Action Law Suite here.

  2. ON my S4 i updated the Android version to 5.0.1 and now i am having issues where is will not ready my sim card. i restart the phone a couple times than it will go back to reading it. Can this be fixed.

  3. Believe it or not this is not a software issue. It is a hardware issue. I finally found out what the issue was. Adding tape to the sim card does not fix this problem. On some S4 models, it is mounted differently. I actually have to see the phone but keep in mind that his worked for 3 out of 4 phones. Its really hard to explain. I don’t want you send me the phone and def do not expect anyone to travel a long time to me. This is an issue that Samsung or phone companies have never resolved. If you are in Toronto area, it may be worth the trip. Even if the “Fix” does not work, It wouldn’t do any damage to the phone.

    I used to have to restart my phone about 3-8 times a day and I understand how annoying this is.

      1. I Had the same problem and already tried every suggested fix on the net, and nothing worked.
        i Even sent it to the dealer, and they told me it’s a motherboard problem and needs to be changed, but i wasn’t willing to spend 250$
        I almost threw the towel 🙂 till i found a post that recommended removing the two screws above the battery
        and when i removed them the error stopped, even the heating problem went away.
        it’s been three days now, and i even tried two different sim cards to try and check if i get the error back.
        so far so good.

        Please try it, and i hope it helps

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