“No SIM” Card or Invalid SIM Issue on iPhone? Try Out These Fixes


There are quite a few issues that seem unreal and even weird to a great extent but they do exist and even tend to crop up when you expect them the least. And”Invalid SIM” or “No SIM” on the iOS device is one of them. So, if (out of the blue) you have encountered the no SIM card installed on the iPhone issue, you should treat it just like any other problem.

As to what may be the reason behind this issue, it could be due to multiple things like a random glitch, outdated carrier setting, and even unnoticeable damage. To help you sort out the issue, we’ve lined up some workable solutions that have proved to be reliable for many iOS users in resolving iPhone not detecting SIM problem. Give them a try!

iPhone Not Detecting SIM? Here is the Fix

SIM not Installed in iPhoneFirst things first:

  • Ensure that you have an active plan with your wireless carrier. Your phone company account must be valid. If the account is invalid, canceled, or suspended, your iPhone can’t connect to its network.
  • Make sure not to use a SIM tray from a different model iPhone or from another phone manufacturer.
  • Ensure that you have inserted the correct size of the SIM (standard, microSIM, or nanoSIM).
  • If the card and the slot are dirty, they may prevent the smartphone from connecting to the cellular network. Use compressed air to clear out lint or dirt. You can also blow into the slot a few times to clear away the lint.

Turn ON/OFF Airplane Mode

Whenever I find the cellular network playing hide and seek on my device, the first trick that I try to get back the full network connection is simply turn on/off . And it does get rid of the problem most of the time. So, I’m going to trust this simple yet reliable troubleshooter that’s just a swipe away.

On your classic iPhone and iPad with Touch ID: Swipe up from the bottom to access Control Center and then turn on Airplane Mode.

Toggle-On-Off-Airplane-Mode-on-iPhone-or-iPadOn your iPhone and iPad with Face ID: Swipe down from the top right corner to bring up Control Center. Then, toggle on the Airplane Mode.

Note: On your iPhone X, you need to swipe down from the top right corner of the screen to access to Control Center.

Turn On Airplane Mode in Control Center on iPhoneSide Note: If you are new to modern iPhones like iPhone X, check out this guide to master the swipe gestures.

Now, wait for some time and then turn off Airplane Mode. Check if you have solved this “No SIM” issue on your iOS device. If yes, you are good to go!

Reboot your iPhone

Many a time, you can fix some common problems like app freezing and touchscreen unresponsiveness just by restarting the device. Therefore, giving a miss to this reliable problem-solver wouldn’t be a good idea.

On iPhone and iPad with Touch ID: Press and hold the sleek/wake button until the power off slider appears. Then, drag the slider and wait for 30 seconds for the device to shut down.

On iPhone and iPad with Face ID: Press and hold both the side button and volume up/ down button at once. Then, drag the power off slider to turn off the device.

Now wait for some time and then restart your device. Simply, press and hold the sleep/wake button until the Apple logo shows up on the screen.

Remove your SIM Card and Re-Insert It

If the issue still persists, remove the SIM card and reinsert it. Use the SIM ejector tool to pop out the SIM tray. And then, make sure to clean it ensuring there is no lint or dirt on it. After that, put the SIM card perfectly on the tray and reinsert it. Make sure the tray isn’t loose.

Check for A Carrier Settings Update

Carrier providers release updates from time to time to address issues and improve cellular network connectivity. If the problem is related to cellular network connectivity, it can be fixed just by updating the carrier setting.

For the uninitiated, it includes updates from Apple and the carrier and consists of many carrier-related settings like network, calling, cellular data, messaging, personal hotspot, and voicemail.

If a carrier setting update is available, you will get a prompt to install it. Besides, there is also an option to manually check the update and install it.

Go to Settings → General → About. If there is an update available, you will get a prompt to update it. Once the carrier has been updated, check out if the problem is solved. If it has, amazing.

Just in case the issue is yet to be resolved, continue reading…

Try Inserting Another SIM

If the issue hasn’t yet been sorted out, the SIM card might be damaged or defective. And the easiest way to check out whether it has a hardware issue is to insert another SIM. If your device can connect to the phone network when you use another SIM, it means your SIM card has some issues. If it’s the case, contact your carrier provider to inquire about it and ask for a new SIM card.

Update iOS on Your iPhone

Outdated software could be the villain behind this “no Sim” issue on your device. So, just in case your device is still stuck with the old iOS version, be sure to update it to get rid of the issue.

Open Settings app → General → Software Update and then check out if there is an update available. If it’s there, download and install the update.

Tap-General-and-Then-Software-to-Update-iOSIf nothing works….

Most of the time, you may not have to come this far. But weird things do happen in life. And so do the unexpected issues. So, if none of the above solutions have been able to troubleshoot the issue, contact Apple Support.

Wrapping up:

Here I’m hoping that the problem is finally behind your back! From what I have experienced, the issue easily gets sorted out by trying out some preliminary solutions like rebooting and removing/reinserting the SIM. And if there is a software bug, updating iOS or carrier settings solves the mess.

Let me know which one of the above-explained solutions helped you in troubleshooting the problem. If you have overcome it by trying out any other trick, do tell us about that as well.

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