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Hello, We understand how frustrating it is to not have a stable internet connection. This article provides some troubleshooting steps that may help, such as testing the connection with the phone in Safe Mode. https://www.samsung.com/us/support/troubleshooting/TSG01001245
If you are still experiencing network service issues with calling, SMS or MMS messages, network signals, mobile data, or hotspots after resetting the device, you may need to contact your carrier as recommended by @Geek_DTech.