The Sprint sub-brand, Boost Mobile, announced on Thursday a $50 Monthly Unlimited plan for its iDEN-based offerings that includes unlimited monthly calling minutes, text messaging, wireless Web access and push-to-talk services. The pre-paid plan will offered starting on January 22nd, and Boost is expecting it will attract many customers currently on subscription plans, with the majority expected to switch over from T-Mobile's own subscription services.

At the same time, Boost said it will launch new devices, including an entry-level candy-bar handset and possibly a smartphone, though these are unconfirmed. The plan bests the current offering for iDEN clients of 600 daytime minutes, unlimited nights and weekends along with unlimited web, texting and PTT services which costs $70. CDMA customers in select markets already get an unlimited plan without the push-to-talk feature for the same $50. [via RCR]