(If the signal light is not on or flashing, the first thing to do is to confirm whether the broadband phone is normal. The phone should check whether the connection line (the phone line with the splitter) is normal. You can unplug the two ends and re-plug it, and then turn off the power of the broadband modem. After two or three minutes, restart and check if the light is stable. If you have tried it and it is still unstable, please call 10000-1-2 to report the fault of the broadband;)