used ht702 for 4 years, high pitched sound coming from power adapter, and bought an obihai 202 and got the credentials and worked for the next 2 years. Now phone doesn't work properly. I can make calls but cannot receive calls. I tried using the old granstream ht702 but does nothing it seems it lost its login information after i reset the granstream ht702. So I am back to obihai202 and dont know what to do.