Invalid SIM On iPhone? Here’s Why & The Real Fix!

A pop-up appeared on your iPhone saying “Invalid SIM” and you’re not sure why. Now you can’t make phone calls, send texts, or use cellular data. In this article, I’ll explain why it says Invalid SIM on your iPhone and show you how to fix the problem for good!

Turn Airplane Mode On and Back Off

The first thing to try when your iPhone says Invalid SIM is to turn Airplane Mode on and back off. When Airplane Mode is on, your iPhone disconnects from cellular and wireless networks.

Open Settings and tap the switch next to Airplane Mode to turn it on. Wait a few seconds, then tap the switch to turn it back off.

airplane mode off vs on

Check For A Carrier Settings Update

Next, check to see if a carrier settings update is available on your iPhone. Apple and your wireless carrier will frequently release carrier settings updates to improve your iPhone’s ability to connect to cellular towers.

To check for a carrier settings update, go to Settings -> General -> About. Wait here for about 15 seconds — if a carrier settings update is available, you’ll see a pop-up on your iPhone display. If you see the pop-up, tap Update.

Carrier Settings Update On iPhone

If no pop-up appears, a carrier settings update probably isn’t available!

Restart Your iPhone

Sometimes it’ll say Invalid SIM on your iPhone simply because of a minor software crash. By turning your iPhone off and back on, we allow it to shut down all of its programs naturally. They’ll have a fresh when you turn it back on.

To begin turning off your iPhone 8 or earlier, press and hold the power button until slide to power off appears. If you have an iPhone X, press and hold the side button as well as either volume button. Swipe the red power icon from left to right to shut down your iPhone.

slide to power off power icon on iphone

Wait a few seconds, then press and hold down the power button or side button to turn your iPhone back on.

Update Your iPhone

Your iPhone could also be saying Invalid SIM because it’s software is out of date. Apple’s developers often release new iOS updates to fix software bugs and introduce new features.

To check for an iOS update, go to Settings -> General -> Software Update. If an update is available, tap Download & Install.

update to ios 11.4

If it says “Your iPhone is up to date”, no iOS update is available right now.

Eject and Reinsert Your SIM Card

So far, we’ve worked through a lot of iPhone troubleshooting steps. Now, let’s take a look at the SIM card.

If you recently dropped your iPhone, the SIM card may have been knocked out of place. Try ejecting the SIM card from your iPhone, then putting it back in.

Where Is The SIM Card Located?

On most iPhones, the SIM card tray is located on the right edge of your iPhone. On the earliest iPhones (original iPhone, 3G, and 3GS), the SIM card tray is located on the very top of the iPhone.

iPhone Eject SIM Card

How Do I Eject My iPhone SIM Card?

Use a SIM card ejector tool or a paper clip and press down in the small circle on the SIM card tray. You’ll have to apply a fair bit of pressure to get the tray to actually eject. Don’t be surprised when your iPhone says No SIM when you open up the SIM card tray.

Make sure the SIM card is properly positioned in the tray and reinsert it. If it still says Invalid SIM on iPhone, move onto our next SIM card troubleshooting step.

Try A Different SIM Card

This step will help us determine whether you’re dealing with an iPhone issue or a SIM card issue. Borrow a friend’s SIM card and insert it into your iPhone. Does it still say Invalid SIM?

If your iPhone says Invalid SIM, you’re experiencing an issue with your iPhone specifically. If the problem went away after you inserted a different SIM card, then there’s a problem with your SIM card, not your iPhone.

If your iPhone is causing the Invalid SIM problem, move onto the next step. If there’s a problem with your SIM card, contact your wireless carrier. We’ve provided some customer support phone numbers below in the “Contact Your Carrier” step.

Reset Network Settings

Your iPhone’s network settings includes all of its cellular, Wi-Fi, Bluetooth, and VPN settings. Your iPhone may say Invalid SIM if there’s software error within the cellular settings. Unfortunately, these problems can be difficult to pin down, so we have to reset all of your iPhone’s network settings.

Pro-Tip: Make sure you write down all of your Wi-Fi passwords before resetting network settings. You’ll have to reenter them after resetting your iPhone.

To reset your iPhone’s network settings, go to Settings -> General -> Reset -> Reset Network Settings. You’ll have to enter your iPhone passcode, then confirm the reset.

how to reset the network settings on iphone

Contact Your Wireless Carrier Or Apple

If it still says Invalid SIM on your iPhone after you’ve reset the network settings, it’s time to contact your wireless carrier or visit your local Apple Store.

With SIM card issues, we recommend going to your wireless carrier first. It’s more likely that they’ll be able to help you fix the Invalid SIM problem. You may only need a new SIM card!

Visit your wireless carrier’s retail store or call the phone number below to get in touch with a customer support representative:

  1. Verizon: 1-(800)-922-0204
  2. Sprint: 1-(888)-211-4727
  3. AT&T: 1-(800)-331-0500
  4. T-Mobile: 1-(877)-746-0909

Let Me Validate Your SIM Card

Your iPhone SIM card is no longer invalid and you can continue making phone calls and using cellular data. Next time it says Invalid SIM on your iPhone, you’ll know how to fix the problem. If you have any other questions about your iPhone or your SIM card, leave a comment down below!

Thanks for reading,
David L.

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