Sprint is offering an unlimited plan for $15, and no, that's not a typo

While Sprint can't compete with Verizon and AT&T on network coverage or exclusive devices, it's always had the advantage of being dirt cheap. Sprint's offerings have always been significantly less expensive than the competition, but with a new deal that offers unlimited data, calling, and texting for $15 per line, things just went up a notch. Of course, there's one big asterisk attached to this deal, and it's that you have to be porting in each line from another carrier to qualify. Sorry, existi...