One of the main functions of iPhone is used to make calls when you insert the SIM card. But some of the users may get the error messages saying “No SIM card installed”, “Invalid SIM” or “Insert SIM”. That means iPhone cannot recognize the SIM inserted in it and hence unable to connect to cellular network, make or receive phone calls, and send messages. Once you are having his problem, please just calm down, keep on reading below article and we will explain the reasons may cause this problem and give you some solutions to fix it.
Part 1: Why iPhone Says No SIM Card?
The several causes of iPhone no SIM card message is complex:
a. System Glitch
It might be the simple glitch that can be fixed after several attempts. Sometimes the system might go wrong because of small glitches and fail to detect your SIM card. Don't worry. It's easy to be solved after a reboot.
b. Battery Got Overheated or Wet
If your iPhone got overheadted/wet, problems might be about to occur. Temperature and moisture are significant factors that have influence on the performance of the device. Therefore, it's of importance to place and use your iOS device in a proper environment.
c. A Dusty SIM Card
If you just inserted your SIM card into the slot and found "No SIM Card" error, please make sure that you've put a clean SIM card into your device. Please detach it from the slot and clean it up with fabric. Also, don't forget to clean up the slot with a blow.
d. A Faulty SIM Card
If your SIM card has been damaged or useless due to reasons, it certainly cannot be used any more. Please contact your carrier to switch to a new one.
Part 2: How to Fix iPhone Not Detecting SIM Card
Below we provide some solutions for the problem that iPhone shows no SIM card is installed.
Turn on Airplane Mode and Turn it Off
This is an easy and simple remedy. Visit Control Center and tap on Airplane icon. After about ten to fifteen seconds turn the mode off and see if the SIM Card is getting detected.
Clean the SIM Card Slot
The SIM Card tray slot must be kept clean and dust free at all times. The dust that gets accumulated in the slot prevents the sensors from detecting the SIM.
Ensure this by first ejecting the SIM tray and then cleaning the slot with an unused soft bristle toothbrush or with a paper clip. Now re-seat the SIM in the tray and place them back in the slot carefully.
Check the SIM Tray
iPhone SIM Card tray can be ejected from the slot by using a simple paper clip. Insert the clip in the small hole on the tray and press lightly. The tray automatically pops-out. Now pull the tray out of the slot. Carefully examine that the tray is not disfigured or damaged. It must hold the SIM Card firmly. If the tray seems to be lose, i.e., it does not hold the SIM properly or does not fit in the slot exactly, contact your nearest Apple Store to fix it.
Please DO NOT use another device’s tray in your iPhone. It could damage your SIM and iPhone permanently.
Test with Another SIM Card
Using a SIM Card, other than your original one, can be helpful to test if your original SIM is damaged. Just contact your Carrier’s retail store and put in a request to issue another SIM Card or just replace the old one if another SIM card can be detected.
Update Carrier Settings
Another simple yet effective DIY technique to verify whether or not your carrier settings are updated. Just visit Setting> General> About. Here you might get a prompt to update, do so to by tapping on “OK”. This ensure all changes made by your carrier company to enable your iPhone to connect to a network are installed in your device.
It is advisable to always use your iPhone with the latest iOS version. You must regularly check to download updates in Settings and install them to ensure your iPhone is secure and free from any software malfunctions that could settle the problem of iPhone not detecting SIM Card.
Refer to the picture below and follow the steps to update your iOS.
Restore iPhone to Factory Settings
If your iPhone shows no SIM Card is installed even after you have followed all the tips given above, here’s what you need to do next to solve the problem. Take a back-up of all your information and data stored on iPhone using iCloud or iTunes. Once this is done, visit Settings> General> Reset> Erase All Content and Settings to erase all data and contents from your device. This wipes off all information and settings from your iPhone and makes it as good as a new phone.