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the back of your modem should have two ports. One should have a little telephone next to it, and the other should have a picture of a phone jack or something on it.
The one with a picture of a phone jack is the one that should be plugged into the wall.
One thing to try is to take the cable out of a working phone, leave it plugged into the same wall jack, and plug it into your modem. That way you know both the wire and the wall jack work.
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