The Samsung Z Fold 3 has a known network connection issue. The issue started with the latest Android 12 software update. There is a fix, as of February 18, that is supposed to correct the issue. And, as far as I have learned, you need to wait to receive the updated fix in order to correct it. In the mean time, changing your Network mode from 5G down to LTE 3G and turning on WiFi calling will help temporarily.
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