Thank you for reaching out. I can certainly understand your frustration with the calls being dropped. As you have tried replacing the SIM card and replacing the phone this would be a carrier issue. I would recommend reaching out to your carrier for further assistance.
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HI, I am sorry you are having this frustrating experience making phone calls. If your phone is dropping calls occasionally, it is most likely a signal issue. However, frequently dropped calls may happen because of a damaged or inappropriately inserted SIM card. Other times, the phone may have physical or liquid damage. There are a few appropriate troubleshooting methods, such as rebooting your phone, performing a software update, or doing a factory reset. Please give these steps a look and try them: https://www.samsung.com/us/support/troubleshooting/TSG01001240/
What do you suggest when your most recent update is causing the issue? My wife and I both have a Galaxy Note 10 + (USCellular) and we updated our phone a couple weeks ago on the same day. Both of our phones have been dropping calls and saying "No SIM card detected". We contacted USCellular and they gave us new SIM cards and we reset our network settings.
