If you own an iPhone 8 or an earlier model than that, you must press and hold either the Top or Side button. Restarting Your iPhone Might Make an “Invalid SIM” Message Go Away ![]() Wait a few moments for the update to go into effect, then see if the message appears again.If there is an update, hit Download and Install.Plug your device into an outlet, then connect to the internet via your Wi-Fi network.It might be a simple software glitch that’s causing them to appear. In some circumstances, you can do away with these messages by downloading the latest version of iOS. Updating Your iPhone to the Latest Version of iOS Can Get the “Invalid SIM” Message to Go Away ![]() Assuming that you do have a carrier and phone plan, you might need to reach out to your carrier just to be sure that your bill is paid up. ![]() If that’s the case, then most of the device’s functionality is going to be compromised.
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