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What To Do When Your iPhone Says No SIM
Updated April 18, 2017
If your iPhone stops connecting to cellular phone networks, you won t be able to make and receive calls or use 4G wireless data. There are a number of reasons why this can happen, including that the iPhone doesn t recognize the SIM card.
You ll know this is happening if a message on the iPhone home screen says No SIM Card Installed. You ll also notice that in the top left corner of the screen, the carrier name and signal bars/dots have been replaced by No SIM or Searching .
In many cases, this problem is caused by your SIM card becoming slightly dislodged. Fixing this problem requires no more than a paper clip. Even if that s not the problem, most fixes are pretty easy. Here s what to do if your iPhone says No SIM .
Locating the SIM Card
To fix SIM card issues, you have to know where to find the card (and if you want to learn a lot more about what the SIM card is and what it does, check out What is an iPhone SIM Card? ). The location depends on your iPhone model.
- iPhone, iPhone 3G, iPhone 3GS: Look for the hold button and the headphone jack at the top of the phone. You ll find a slot with a tiny hole in it. This is the tray that holds the SIM card.
- iPhone 4 and newer: On the iPhone 4 and newer, the SIM tray is on the right side of the phone. The iPhone 4 and 4S use a microSIM, while later models have a nanoSIM, a slightly smaller, more modern version of the SIM card.
Re-Seating the SIM Card
To re-seat the SIM card in its slot, get a paper clip (or, as Apple cheekily calls it, the SIM card removal tool ), unfold it, and gently push one end into the hole in the SIM card tray. This will pop the tray out of its slot. Push it back in and make sure it s firmly seated.
After a few seconds (wait up to a minute), the No SIM Card Installed error should disappear and your regular bars and carrier name should re-appear in the top left corner of the iPhone s screen.
If it doesn t, fully remove the SIM. Make sure it—and the slot it sits in—aren t dirty. If they are, clean them. Blowing into the slot is probably OK, but a shot of compressed air is always best. Then, reinsert the SIM.
Step 1: Update iOS
If reseating the SIM card didn t work, next you should check to see if there s an update to the iOS, the operating system that runs on the iPhone. You ll need to connect to a Wi-Fi network and have a decent amount of battery life before you do this. Install any available updates and see if that solves the problem.
- Tap Settings
- Tap General
- Tap Software Update
- If a new version is available, follow the onscreen instructions to install it.
Step 2: Turn Airplane Mode On and Off
If you re still seeing the SIM error, your next step is to turn Airplane Mode on and then off again. Doing this can reset the iPhone s connection to cellular networks and may resolve the problem. To do this:
- Swipe up from the bottom of the screen to reveal Control Center
- Tap the airplane icon at the far left so that it s highlighted
- Wait a second or two and then tap it again, so that the icon is not highlighted
- Swipe Control Center down to hide it
- Wait a few seconds to see if the error is fixed.
Step 3: Restart iPhone
If none of the steps so far has solved the problem, your next step is the all-purpose fix for many iPhone problems: a restart. You d be surprised how many issues a restart can solve. To restart the iPhone:
- Press the hold button (on the top right of early models, on the right side of more recent models)
- Keep pressing it until a slider appears on the screen that turns off the iPhone
- Let go of the hold button and swipe the slider left to right
Learn the everyday tricks and simple fixes savvy Apple users rely on.
- Wait for the iPhone to turn off (it s off when the screen goes fully dark)
- Press the hold button again until the Apple logo appears
- Let go of the hold button and wait for the iPhone to restart.
Step 4: Check for Carrier Settings Update
Another culprit behind the SIM not being recognized could be that your phone company has changed settings for how your phone connects to its network and you need to install them (to learn more about carrier settings, read How to Update Your iPhone Carrier Settings ). This process is easy, too:
- Tap Settings
- Tap General
- Tap About
- If an update is available, a window will pop up. Tap it and follow the onscreen instructions.
Step 5: Test for a Malfunctioning SIM Card
If your iPhone still says it has no SIM, your SIM card could have a hardware malfunction. One way to test this is by using a SIM card from another cell phone and seeing what happens. Make sure to use the correct size—standard, microSIM, or nanoSIM—for your phone. If the No SIM Card Installed warning disappears, then your iPhone SIM is broken.
Step 6: Make Sure Your Account Is Valid
It s also possible that your phone company account isn t valid. In order for your phone to be able to connect to a phone company network, you need a valid, active account a the phone company. If your account has been suspended, canceled or has some other problem, your may see the SIM error. If nothing else has worked so far, it s worth checking with your phone company that your account is OK.
Step 7: If Nothing Works
If all of these steps don t solve the problem, it s likely that you ve got a problem that you can t fix. It s time for a trip to your closest Apple Store or your phone company store, or to call tech support. Get step-by-step instructions on how to do this in How to Make an Apple Store Appointment .
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