Night and Weekend minutes are minutes that can be used for any domestic number. Landline or mobile. Sprint offers for its Everything Data customers the benefit of AnyMobile, Anytime so you are free to call any domestic wireless number anytime, without using minutes.
Sprint Mobile To Mobile is only for Sprint or Nextel or Boost subscribers directly calling each other. At this time, Virgin Mobile and Helio are not included in this plan.
Holidays are also not free, unless they fall into your Night and Weekends, Any Mobile Anytime, or Sprint Nextel to Sprint Nextel. Holidays that fall on weekdays are billed according to the time the call is made.
Everything Data plan subscribers are offered CONDITIONAL CALL FORWARDING free of charge and free of minute charges. Unconditional Call Forwarding is still charged $0.20 per minute plus applicable long distance fees.
One slight correction to rwalford79's post...
Conditional call forwarding is free and included in all plans. Conditional call forwarding is used for no answer/busy, usually used for 3rd party voicemail systems.
Unconditional call forwarding is $0.20/min. Unconditional call forwarding means your entire number is forwarded, regardless of whether your phone is turned on or off, in signal, or not. Your phone will never ring when you have unconditional call forwarding turned on.