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.
If you complete all of 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.
