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Hello, We definitely understand how frustrating dropped calls are! Here are several troubleshooting steps and tips that may help. https://www.samsung.com/us/support/troubleshooting/TSG01001240
If you are experiencing network service issues with calling, SMS or MMS messages, network signals, mobile data, or hotspots after resetting the device, you will need to contact your carrier.
We also recommend submitting an error report: https://www.samsung.com/ae/support/mobile-devices/raising-an-error-report-via-samsung-members-app/
If you complete all the troubleshooting and are not having issues with the network, such as mobile data, texting, etc., then it would be recommended to have the phone evaluated by a certified technician. You can use the following link to find a list of service centers in he U.S. that can do the repair: http://www.samsung.com/us/support/service/ or by contacting customer support at 1-800-726-7864.
For assistance outside the U.S., please use this link: https://www.samsung.com/us/common/visitlocationsite.html