Please check the following: Telephone 1 LED (Telephone 2 LED if there is also a line connected to the Telephone 2 connection on the back of the advanced modem) is ON. If the LED is flashing, check all your phones to see if one is off the hook. Make sure all phones are hung up properly. If you are using a cordless phone, check the power or battery status of your phone(s). Check the telephone cables to ensure they are connected tightly and the cables are not cracked or broken. If your phone service is still not working, please try the following steps: Try plugging a standard phone directly into the Telephone 1 (Telephone 2 if applicable) connection on the back of the advanced modem and check for a dial tone. If there is a dial tone, then there may be an issue with the wiring to the phone jack. It is recommended that you leave the phone connected directly to the advanced modem to place or receive calls until the issue can be corrected. If you still do not have phone service, it may be that there is an issue with your advanced modem. It may be necessary to reset the advanced modem. To reset the advanced modem, press the recessed "Reset" button with a pen tip or other pointed non-metallic object on the back of the advanced modem. Once the online light is solid, connectivity to the network has been restored. If you have reset the advanced modem and still do not have a dial tone, please check the status of the lights (LEDs) on the modem. For normal operation of the advanced modem the Power, DS, US, and Online lights should all be on solid. The Telephone 1 LED on the front of the advanced modem should be on solid if the phone is on the hook. If the LED is flashing, check all your phones to see if one is off the hook. Please contact us if any of these steps fail or if you need additional assistance.