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Hi, what happens if you plug a different phone, if you have one, into the same line that the non-working phone is plugged into?
this would be just to verify it is the phone, not permanent. can you do that?
that is the only way to test the phone. many times att and integra say everything is fine, but they could not have tested it without checking the phone. the only way to really know is to plug a working phone into that line, OR take the phone that is not working and plug it into another line that you know works. i do this for a living, you can just do it, i don't know whom is saying phones can't be moved to for testing as long as you put them back. it is not true. sorry...