is it only the phones with the polarity guard that aren't working ?

can a plain old cheapo phone call out ?

have you tried the polarity guarded phone plugged in at the NID ?

if you dont feel competent enough to swap polarity at the NID or take a jack of the wall and swap the wires how do you feel competent to install a polarity guard ?

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Serving SW and West central Fl since 1984