Baby boomers and their parents can love smartphones just as much as millenials and post-millenials do. T-Mobile recognized that and launched a special plan with unlimited data for subscribers 55-years-old and above last year. Now, Sprint has followed suit: the carrier has announced a very similar plan for new customers 55 and up. The new plan called "Unlimited 55+" -- T-Mobile's is called One Unlimited 55+ -- will set subscribers back $70 per month for two lines with unlimited talk, text and data. And just like T-Mobile's, a single line costs $50, so those interested may want to find a friend to sign up with them.