Not to anywhere near the degree that it would "end civilization". And land lines would still work just fine.

As for the "magnetic reversal", search the Conspiracy Theory threads for the numerous debunkings of the ideas that it could "end civilization" or that it's happening anytime soon.

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"If this were play'd upon a stage now, I could condemn it as an improbable fiction."
Shakespeare, Twelfth Night
"The Mayan symbol for "book" looks a lot like a triple hamburger, but I've never seen them claiming it as proof the Mayans had Big Macs." - KaiYeves
"Distance doesn’t matter much in space, where if you just start a thing off with the right kind of shove, sooner or later it will get where you want it to go." -Frederik Pohl, Mining the Oort