My Samsung SCS-2U01 has been working for at least 10 years. The past 2 days I have lost my connection. System LED is blinking red, which the manual says is: "Blinks red while establishing an initial network connection." I unplugged and restarted twice. The external antenna has not been moved. How do I even know the Verizon network system is working? What else can I try? Who can I call? thanks. Mark