Android's USB tethering lets you reliably share internet from your phone, but it may fail sometimes. Here are some quick fixes to get it working again.
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Here's How to Actually Fix the "No SIM Card Detected" Error on Your Android Phone

If your Android phone is showing a “No SIM Card Detected” error, you can’t connect to your cellular network. When that happens, you can’t use your phone to make or receive calls, send texts, or ...