Boost Mobile continues to expand its diverse handset lineup with the $50 Monthly Unlimited Plan on the Nationwide Sprint Network by launching the Samsung Seek. Boost Mobile’s first touchscreen device with a slide-out QWERTY keypad is designed to deliver easy access to multiple messaging options and popular social networking sites. The Seek is an ideal complement to the Boost Mobile Monthly Unlimited offer, which includes nationwide voice, text messaging, Web, e-mail, …