Samsung A21s SIM card not detected

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Table of Contents Show

What to do when your SIM card can't connect to your carrier's network
What Does Not Registered on Network Mean?
Causes of Not Registered on Network Error
How Do I Register My Samsung Network?
How to proceed when the SIM card is not recognized on my Samsung Galaxy A21S
Clean SIM card
Check the tracking of the SIM card on your Samsung Galaxy A21S
Test the SIM card on a different smartphone
Try another SIM card on your Samsung Galaxy A21S
Confirm that your Samsung Galaxy A21S is not Simlocker
Check that the problem will not result from the ROM installed on the Samsung Galaxy A21S
If perhaps nothing functions
Why is my Samsung s21 not reading my SIM card?
Why is my Samsung not reading my SIM card?
Why is my phone suddenly not reading my SIM card?

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What to do when your SIM card can't connect to your carrier's network

Seeing the 'not registered on network' error on your Samsung Galaxy? Here's what it means and how to fix it.

What Does Not Registered on Network Mean?

If you see the 'not registered on network' error on your device, it means your SIM card can't connect to your carrier's network. You will likely not be able to make or receive calls or text messages. This error can occur on any Android phone, so the steps for fixing it are the same regardless of the manufacturer or model.

Causes of Not Registered on Network Error

There could be an issue with your SIM card, or the problem could be on your carrier's end. Possible causes of the 'not registered on network' error include:

Your phone's firmware or operating system is out of date.
The SIM card is disconnected or damaged.
Your carrier is not selected in your phone's settings.
Your carrier is experiencing an outage.

How Do I Register My Samsung Network?

Try these steps in order until your phone is working properly:

Restart your Android phone. Rebooting your device will clear out any temporary conflicts preventing you from connecting to the network.
Turn off Wi-Fi. Disable Wi-Fi on your phone, wait for 30 seconds, then turn it back on. This resets your connection and can resolve temporary technical hiccups.
Update your Android phone. Make sure your operating system and firmware are current so you have the latest updates your phone needs.
If you rooted your Android phone, you will need to unroot it before you can install updates.
Reinsert the SIM Card. Take out your SIM card and make sure it's not damaged, then put it back in place. Make sure the card is set properly in the tray with the metal pins in the right position.
Manually choose your network. Make sure the correct carrier is selected in your settings. Go to Settings > Connections > Mobile Networks > Network Operators > Search now and select your carrier's network.
Change the network mode. If you're in a low reception area that doesn't support 5G or 4G, it's best to switch to 3G or 2G.
Contact your mobile carrier. Go to a store, or use another phone to call your provider so they can help you resolve the issue. It could be that there's a network outage in your area, so all you can do is wait. If there's a problem with your SIM card, your carrier can help you replace it.
Update APN settings. If you recently changed service providers, you may need to update the Access Point Name (APN) settings. This is an advanced fix, so be careful and write down the default APN settings so you can change them back if something goes wrong.
Reset the network settings. Establishing a fresh connection to your carrier's network can fix problems a reboot can't. Resetting network settings will erase all Wi-Fi passwords and Bluetooth connections, so save this step as a last resort.
Use a different SIM card. If you have a spare activated SIM card, switch it out and see if your phone can connect to the network. If it can, there's an issue with the SIM card. Before you buy a new one, check Samsung's support website to see which SIM cards are compatible with your Samsung Galaxy.

FAQ

What does 'not registered on network' mean on T-Mobile?
In addition to the reasons/solutions listed above, if you recently purchased a phone or you're switching to T-Mobile from another network, you might need to unlock your device with the old carrier. Locate your phone's IMEI number from Settings > About Phone on Android (or Settings > General > About on iOS) and contact T-Mobile to verify your account and help you unlock it.
Why is my phone not registered on a network when roaming?
Your provider might not have roaming agreements with other carriers in the particular area where you're roaming and where they don't provide service. To avoid traveling out of service range, double-check the roaming coverage or look for a coverage map on your carrier's website before you go.

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You have just acquired an Samsung Galaxy A21S and when you turn it on, it displays the following error text message: SIM card not recognized. From time to time the Samsung Galaxy A21S does not recognize the SIM card and displays this message. In this circumstance, it is not necessarily required to bring the Samsung Galaxy A21S directly back. Indeed, there are a lot of techniques to fix this trouble. We will therefore find out in this article, what are the things to do and verify to ensure the SIM card is recognized on your Samsung Galaxy A21S.

How to proceed when the SIM card is not recognized on my Samsung Galaxy A21S

If perhaps the SIM card is not recognized on your Samsung Galaxy A21S, below is a list of things that will help you discover the source of the trouble, find out repairing the trouble.

Clean SIM card

One of the first things to do if the SIM card is not recognized on your Samsung Galaxy A21S is to clean it up. In fact, it might happen that dirt partially prevents the contact between the SIM card and the mobile. To clean it, pass a small dab of cloth over it and check if it is not damaged.

Check the tracking of the SIM card on your Samsung Galaxy A21S

From time to time the trouble might result from the tracking of the SIM card. In fact, it often happens that tiny metal plugs that normally have to come in contact with the SIM card are a bit relaxed. When this is the case, this prevents the Samsung Galaxy A21S from reading the SIM card. To fix this trouble, you just have to thicken the SIM a little by gluing one or two pieces of tape at the back.

Test the SIM card on a different smartphone

To find out if the trouble comes from the SIM card, you can actually test it on a different phone and you will have your answer. If it is not recognized on other devices, you can actually modify the SIM card.

Try another SIM card on your Samsung Galaxy A21S

If perhaps the two previous steps do not give anything, it truly is required to test a different SIM card to find out in cases where the trouble comes from the card. Indeed, in cases where other SIM card function on the Samsung Galaxy A21S, it truly is because the trouble comes from the card. Otherwise, it truly is at the level of the smartphone that we will have to look.

Confirm that your Samsung Galaxy A21S is not Simlocker

In case you have tried a lot of SIM cards on the Samsung Galaxy A21S and non-e are recognized, the smartphone may perhaps be Simlocker. It indicates that the Samsung Galaxy A21S will recognize just the SIM card of a specific operator. In this circumstance, you have to unlock it. You will find without a hassle a lot of provide on the internet that will do that.

Check that the problem will not result from the ROM installed on the Samsung Galaxy A21S

This part mainly concerns the people who root the Samsung Galaxy A21S to install a ROM that is not initial. If perhaps this is actually what you have completed, be aware that the unrecognized SIM card trouble is quite common after setting up new ROMs. We suggest that you reinstall an initial ROM and re-test it.

If perhaps nothing functions

If perhaps all the above solutions do not work, we recommend you to bring your Samsung Galaxy A21S and the SIM card back to one of your operator’s shops.

Why is my Samsung s21 not reading my SIM card?

Loose SIM card slot will caused the card losing the connection with the reader of the device. Solution: You can try to apply some pressure to the slot check again if the slot hold the SIM properly. 3. Dust over the slot and SIM card reader making the slot incapable of reading the card properly.

Why is my Samsung not reading my SIM card?

Enable the SIM card (Settings) Open Settings > Mobile Network. Under SIM Card info and Settings, Tap the SIM, and toggle on “Enable”. Also, make sure the data roaming is ON to avoid this issue when you're in a roaming area.

Why is my phone suddenly not reading my SIM card?

Pull Out the SIM and Put It Back In. Since this issue has to do with your SIM card, you can try ejecting your SIM card from your phone and then putting it back in. If your SIM was not installed properly, or if the SIM card tray was loose, this should fix that for you.