said by sofakng3:I've heard that even with a canceled PTSN line, landline providers MUST support 911 calls so it sounds like I could possibly use that as a "free" 911 backup?
Not true in Michigan, when I canceled my POTS line it went dead, no dial tone and completely unresponsive to any dialing input (including 911). Some voltage was kept on the line, that's all.