WIND Mobile Cost Per Minute free
This is the hardest thing to predict. I feel that they'll be extremely competitive and probably have an unlimited plan for $40/month or less. Voicemail, caller id and several other features will be included at no cost. For kicks, and because they cost nearly nothing, they'll probably include a token number of text messages in this amount as well.
Other plans will probably max out at $25/month, still include a reasonable amount of minutes for most people, and certainly with NO System Access Fee, but they will charge you up-front for the phone since the System Access Fee used to subsidize the cost of the phone itself.