Many users have experienced this problem of Invalid sim card android and they, too, want to know why does is it occur and how to fix it. If you have run into this issue, do not worry; I have compiled a list of the best ways to address the “Invalid SIM card” error on Android. I hope that following them would assist you in resolving the problem. https://www.droidalerts.com/invalid-sim-card-android/
 

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