If your phone suddenly won't recognize your SIM card, don't panic. There are a few things you can do to try and resolve the problem. Here's what to do.

Verify if the SIM card is functional by inserting it into another phone: Use a spare phone to check if the SIM card can connect to the network. Troubleshooting Steps for iPhone Devices 1.

A SIM card that doesn't work can cause a lot of problems. Here's how to fix the "No SIM card" error on your Android phone.

You can't make calls if you get the "SIM not provisioned MM#2" error, but it's easy to fix.

You may have to consider asking for a new SIM card replacement if none of the previous workarounds is able to fix the error and your Huawei P10 / P10 Plus still does not detect your SIM card.

Is your iPhone is telling you it doesn't have a SIM card available? Here are some fast and easy things to try before calling your carrier or the Apple Store.