Many of the iPhone users get annoyingly surprised when they see the “Invalid SIM Card” message. Only some of the iPhone users know why such message appears on their iPhones. When the “Invalid SIM” message appears on your iPhone, you cannot even send a text message. So, it is needless to say how annoying such an issue would be. Well, the purpose of this article is to explain the real reasons behind this issue and how to fix it.
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Turn on and off the Airplane Mode on your iPhone to fix invalid sim card
This is one of the most basic but effective methods you can try to fix an invalid sim card. As per this method, all you have to do is to turn on airplane mode and turn it off. When you switch to Airplane mode, your device will lose all the network and cellular connections. Once you switch it on again, the connections will be reestablished.
The following are the steps you should follow to do it.
- Go to the Settings app and then tap on the switch located next to Airplane mode.
- Wait for a couple of seconds
- Tap the switch again and turn it off once again
Update the carrier settings
If turning on and off the Airplane mode doesn’t work for you, you should try to update carrier settings. In general, both Apple and the wireless carriers offer updates on a frequent basis. Through these updates, they expect better performance on your computer in terms of network connection. Below is how you should perform a carrier settings update.
- Go to Settings app on your iPhone and select the option labeled General
- Then, tap on the option About
- Wait for about 15 seconds
- If there is an update related to the carrier settings, you would see a popup on the display
- Tap on the update if it is available
However, please note that if there is no popup, you already have the latest update.
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Restart the iPhone
Sometimes, an “invalid sim card” message appears as a result of a minor software glitch or a crash. To fix those minor glitches, you can restart the phone. When you restart the device, it will stop all the ongoing processes. Then, it will start with freshly running programs with fixed potential glitches.
In order to begin the process of restarting, you should follow the methods mentioned below. Please note that the process might differ depending on the iPhone model you use.
For iPhone 8 and earlier versions
Press the power button and hold it to see the power slider. This slide will appear with the text “slide to power off”. As it says, you can slide it to turn off the device.
For iPhone X / XS (Max) / XR
If you are using the latest version of iPhones (iPhone X), follow this method. Press and hold the side button with any of the volume buttons. Then, you can swipe the power icon (in red color) towards the right-hand side to shut the device down.
Regardless of the model, after switching off the device, you should switch on the device once again. To do this, you should press the power button or the slide button respectively.
Update the iPhone to fix “invalid sim card” issue
If none of the above methods fix your issue, that could be an issue related to iOS. That means, if the iOS on your iPhone is outdated, you should fix it. The best way to do it is by updating the software. An iOS update will fix all the potential issues and bugs associated with the current version. Also, updating the iOS allows you to experience the new features. You may follow the instructions below to update your iPhone and fix the “invalid sim card” issue.
- Go to the Settings app and select the General option
- Go to Software Update option
- If there is an update, you can tap on the option labeled “Download & Install”.
However, if you find a message “Your iPhone is up to date”, your iOS doesn’t need an update. If you found data loss on your smartphone, here is the best SIM card data recovery for you.
Eject the SIM card and insert it again
All the methods mentioned above are associated with the iPhone. However, in this method, we are going to see if there is anything wrong with the SIM card. If everything looks fine with the iPhone, you should try this method. Such an error can occur particularly if your iPhone encountered a substantial impact (for instance, you dropped it lately!). The SIM card might have gone out the slot or become loose. In this case, you can fix the issue simply by ejecting the SIM card and putting it back correctly.
The location of the SIM card isn’t that hard to be found. Most of the iPhone models have their SIM card tray towards the right edge of the device. However, older iPhone models have the SIM card try on the top part of the device.
Ejecting the SIM card
In order to eject the SIM card, you will have to use a SIM card ejector. If not, you will have to use a paper clip. Carefully press the small circle found in the SIM card tray using the tool. Be sure that you apply some amount of pressure to get the tray to be ejected. After ejecting the SIM card, you will not be able to use the iPhone to make any calls. Now, put back the SIM card in the perfect place without any errors. If the iPhone still reads “invalid sim card”, you will have to troubleshoot the SIM card as well.
Use a different SIM card and check if it works
With this process, you will be able to determine if the issue is actually with the SIM card. All you have to do is to find a SIM that works well on another iPhone. Then, you should insert it on your iPhone and see if you get any error messages. If the “invalid sim card” message is persisting, there is nothing wrong with the SIM card. Instead, your iPhone itself might be the culprit.
If the iPhone displays the same message, you will have to proceed to the next step. However, if you have an issue with the SIM card, you will have to contact the wireless carrier. Then, you will be able to find a proper solution to resolve this issue.
Try resetting the network settings
You should know that the network settings of your iPhone comprise of Wi-Fi, cellular, VPN and Bluetooth settings. If there is something wrong with the cellular network settings of your iPhone, you will have to reset it. But you cannot reset the cellular settings alone. Instead, you will have to reset the entire network settings to resolve this issue. Resetting all the network settings should be done according to the method mentioned below.
- Go to the “Settings” app on your iPhone
- Select the option “General”
- Tap on the option “Reset”
- Then go to the option “Reset Network Settings”
- When prompted, you will have to enter the passcode of the iPhone
- Confirm the resetting process
As a smart measure, we highly recommend our readers to write down the Wi-Fi password before resetting the network. Otherwise, finding the lost Wi-Fi password would be a painstaking task.
Well, if your iPhone still displays the same annoying message, you should contact the wireless carrier. Also, you will have to visit the local Apple store and see what is wrong with the device.
If there is a SIM card issue, the smart move is to contact the wireless carrier first. You will get a new SIM card in most of the cases to fix “invalid sim card” issue. However, if the issue is with the iPhone, you will have to contact the Apple store.