T-Mobile knows you might need a few reasons to switch mobile carriers. That's why it has three. First, when you switch to T-Mobile with at least two qualifying Magenta lines, T-Mobile will give you Netflix for free. Second, it offers unlimited data packages so you can binge-watch season three of "Stranger Things" when it comes out on July 4th. And finally, it will match any employee, affiliate or military discount up to $30 per month for two lines.