Have you ever come across the problem that you are not able to make any call or receive any text messages? And you may see an "Invalid SIM" or "No SIM Card installed" alert on your iPhone. Generally, the error is the so-called iPhone SIM card failure. Try to check whether the iPhone SIM card is damaged, worn or not. If not, maybe there is some bug in it and it can be fixed well by following some methods. Hereby, I will introduce 5 methods showing you how to fix iPhone SIM failure.

Fix iPhone SIM Failure by Turning on Airplane Mode

The iPhone Airplane Mode is supposed to be turned off so that it can work normally. Swipe up from the bottom of your Home screen to open Control Center, then tap iPhone Airplane Mode icon.

Or you can also go to "Settings" > "Airplane Mode" and tap the slider to turn it on.

Fix iPhone SIM Failure by Rebooting the iPhone

If turning on and off the airplane mode doesn't work, you can try rebooting your iPhone.

Keep pressing and holding the Power button until the red slider appears. Drag the slider to turn your device offcompletely . After the device turns off, press and hold the Power button again until you see the Apple logo.