Boost Mobile announced today that starting on or around January 20th it will begin throttling data speeds for its "Monthly Unlimited" customers who exceed 2.5GB of data use. Once this threshold is broken, the company will reduce users' download speeds to a snail-like 256kbps until they enter a new billing cycle. Earlier this year, Boost's sister carrier Virgin started throttling its customers under identical terms. Both companies operate on Sprint's network which currently offers "true" unlimited data to its postpaid subscribers. Boost claims that this change will affect a small percentage of its customers, but perhaps it should consider adopting a new campaign slogan when these changes go live. How about "Restricted: It's the new unlimited"?