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I have had FIOS service since October 9, 2008. Until two weeks ago, I was constantly getting the "Currently Unavailable" message and rebooting about every other day. Then, it stopped. It has been working perfectly for the last two weeks. I have been delighted with the service since this issue has stopped - hopefully for good. I still hate the IMG for its lack of accuracy and information.
As a side note, my billings have been perfect.