Using this tool I was able to find that two wires on the main jack that my Ooma hub was plugged into were reversed causing all jacks to fail in the house too were disabled. rolled over and causing problems with my phone. Corrected the main connector wiring to the correct one. Removed one star for bad design. After the tool is inserted into the socket, the thick body makes it difficult to put your finger through to press the lock. I had to use a screwdriver to press on the tab. I've added a photo of how I changed the tab so it's no longer blocking as the tool needs to be pasted, read slightly and then removed.
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