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Hello, We understand how frustrating it is when your phone is unable to maintain a connection to mobile data.
This article provides the troubleshooting available for poor signal strength. It includes steps such as resetting the network, testing in Safe Mode, and a factory reset. https://www.samsung.com/us/support/troubleshooting/TSG01001598
If the troubleshooting was not successful, you should reach out to your carrier for further assistance.
When troubleshooting is not effective, the Samsung warranty provides repairs for manufacturer defects. To learn more about the warranty, please see this link: https://www.samsung.com/us/support/warranty/
Samsung provides two options for service.
1. Local service center locations: https://www.samsung.com/us/support/service/
2. Ship-in service. The ship-in service is approximately 7-14 days, including shipping times. A loaner device is not provided during this time. You can use the service locator link to create a ship-in service ticket or contact customer service at 1-800-726-7864.
For assistance outside the U.S., please use this link: https://www.samsung.com/us/common/visitlocationsite.html