Yes these phone's are sensitive to the phone jack its plugged into as it powers the backlight and the whole phone itself. You need to check and see at the NID Network Interface device outside and check and see how much voltage you got comming in there. This is a problem too with the phone is if you have more then two phones in the house on this NID, Trust me I have this phone and it is verry sensitive and it requires poer to run the unit this is a factory issue as well they built these phones without thinking about the customers situation.


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