Invalid SIM Card message on Android – What to do

SIM is an abbreviation for Subscriber Identity Module. Without a functional SIM card, you will be unable to make phone calls, send text messages, or connect to the mobile network. So, as you can see, the SIM card is a key component of your phone.

When your SIM card stops working or your Android phone displays an ” Invalid SIM card ” or “No SIM card” notification for whatever reason, your phone becomes almost completely worthless.

The question now is why we receive these notifications on our Android phones and how we can solve this issue. So, without further ado, let’s get started.

Invalid SIM Card message on Android – What to do

To know what to do here, we first have to ask; what is the meaning of the ” No SIM card ” or ” Invalid SIM card ” notification?

There are three scenarios in which your Android phone may display this notification:

  • You forgot to insert your SIM card.
  • The device is unable to detect the SIM card.
  • Loose SIM card connection

Now that you’re aware of the basic causes, next, we’ll go over the technical reasons for receiving the “Invalid SIM card” alert.

The Causes of the Android Device ” Invalid SIM card ” Error

Along with the three reasons mentioned previously, your phone may experience two technical issues that result in this error.

  • Network Lock: There are network providers that implement network locks on their phones. In this case, the phone can only be used with the SIM card that came with it.
  • Region Lock: This lock could have been set by the device’s manufacturer. But when it gets triggered? For instance, this message may appear if you insert a SIM card from a region or country other than the default setting.

How to fix an Invalid SIM card error on an android phone?

Due to various possible reasons for receiving an Invalid SIM Card error, we’ve included all of the solutions to this problem in this section. 

Restart your android phone

When the phone displays No SIM card, the most straightforward and immediate action is to restart it. Fortunately, if any changes take place and the message is no longer displayed, you are lucky and do not need to test the alternative solutions.

Insert a working SIM card

Inserting a working SIM card can be helpful. If an active SIM card is usable on the phone, potentially the problem is with your SIM card. If it still does not work, you should inspect your phone tray to determine whether it is broken or damaged.

Re-insert the SIM card

A misaligned SIM card is another possible cause of the Invalid SIM card error. While resolving the problem, it is critical to exercise caution, as any scratch on the SIM card will result in additional issues.

To remove the SIM card, follow these steps:

  • First of all, you should shut your android phone down. If the battery is removable, take it out. Then you will see the SIM card beneath the battery. Remove the SIM card and then re-insert it. Now switch your mobile on, and if the notification is gone so, it’s okay.
  • If your phone is one of the late models, you should use a suitable SIM card remover tool. To do this, insert the remover tool in and push it gently. The tray will eject automatically. Re-insert the SIM card and check if the notification is gone or not.

Clear the cache and data on your android phone

You can also try clearing the cache and data. 

  • Navigate to Setting > Storage > Internal Storage > Cached data. 
  • A message will show on the screen of your Android phone after tapping the Cache data. It says that clicking delete will remove the cache for all apps. At this point, tap “Delete.”

Restart your phone and check to see if the issue has been resolved. If the issue persists, continue to the next step.

Set the network mode to “Auto.”

Another possibility is that there is an issue with the network mode.

  • To get behind this step, go to Setting > Mobile Networks > Network mode.
  • Select the first option, which is LTE/WCDMA/GSM (auto connect).

That’s it. Make sure if the problem has been resolved or not.

Switch to the proper network operator

In this section, we recommend checking your network operator since you may have accidentally switched to another one.

  • Navigate to the Settings menu
  • Tap on “Connections”
  • Click “Network Operators”
  • In the “Search network,” choose “Select Manually” and then the correct network operator based on your network provider.

Switch the “Airplane Mode” on and off

Another way to ensure that your Android phone is connected to the correct network is to activate and deactivate airplane mode. 

Although airplane mode is intended to be used while flying, it can resolve the issue because it temporarily disables the cellular network and then re-enables it.

Additionally, it is also regarded as the quickest method compared to restarting the phone, as both do the same function when it comes to disabling and enabling the cellular network.

Reset the Network Setting

Connectivity-related errors can be resolved by resetting the network settings. Due to the possibility that the Invalid SIM card issue is connected to the phone’s connectivity, we suggest that you reset the network and see what happens.

It’s worth noting that restarting the network settings will restore Wi-Fi, Cellular, and Virtual Private Network (VPN) to their default settings. Therefore, make a note of your login and password in case you need to reconfigure these three options.

Follow the steps below to complete this action:

  • Go to the “Settings”
  • Tap on the “General Management”
  • Select “Reset Network Setting.”
  • If your Android phone’s Settings menu has an option for “Advanced” and then “Reset options,” select that and tap “Reset Wi-Fi, mobile, and Bluetooth.”

Continue to the following step if you keep receiving SIM card notifications.

Switch to safe mode

The “No SIM card” notification may display as a result of third-party apps. In safe mode, your phone will reboot, and all third-party apps will be disabled. If the problem is resolved in this mode, you can nearly be certain that a malfunctioning app caused it.

  • Hold down the Power button.
  • Next, tap and hold Power Off.
  • When the Reboot to Safe Mode prompt displays, either tap it again or hit OK.

Update Firmware

While updating Firmware is primarily intended to provide you with the latest features, it can also be used to fix the Invalid SIM card issue.

Here’s what you need to do:

  • Connect to a Wi-Fi network that provides a stable internet connection.
  • Open the Settings menu
  • Tap on “Software Update.”
  • Following that, select “Download and Install” to initiate the update process.

Change Network APN settings manually 

If there is an issue between the device and the network, you should configure the APN settings manually.

To do this, follow the steps below:

  • Go to “Settings”
  • Tap on “Network and Internet” and then “Mobile Networks.”
  • Select “Advanced” and then “Access point names.”
  • Tap on the “+” sign.

There are two methods for populating the APN setting fields. The first option is to contact your network provider and request the APN settings or Google search for your network provider’s APN settings.

Factory Reset

As a last resort, if you’ve tried all of the other methods above, you can reset factory settings.

Make a backup of the information and data on your Android phone before you begin so that you restore it later because a factory reset deletes all of your phone’s data and information and returns the configuration of your phone’s settings to the condition in which it was sold.

To factory reset the android phone:

  • Go to the Settings menu and then “General Management.” 
  • Next, tap on “Reset.”

If you couldn’t find these options, go to “Privacy” and then “Back-up and Reset.”


If you follow the methods listed in this article, you should be able to fix any Invalid SIM card or No SIM card notification unless the issue is hardware-related. Additionally, we recommend that you contact your network provider’s customer service and share the problem before visiting a phone repair center.