I've use Primus VOIP for going on 3 years... Love it...
Cheap, every feature, easy, free long distance, Software phone, portability.
Without backup power, your power goes out so does your phone, sketchy quality if you don't set it up correctly. 911 address is registered, so if you move you have to change the address yourself, or they show up at your old house..
Unless some provider comes out with excatly the same service at a better price, I'd NEVER switch..
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VOLCANO VAPORIZERS