A:AnswerBoost Mobile (formerly on the Sprint network) is now on T-Mobile's network. Dish, which now owns Boost Mobile, is contracted with T-Mobile for the next 7 years. So yes, this phone will now work with Boost Mobile accounts.
A:AnswerNokia says it does not work on Verizon, but I am curious about that because the PC Mag review of the 5.3 states that they had no problems using the 5.3 on Verizon in Philadelphia. In fact, I believe they even said that the connection was great.