Sorry, there are no free mobile-to-mobile, Virgin-to-Virgin, weekend or night calls. All calls, incoming & outbound, will be charged against your account according to your plan. The only exceptions are 911 and Virgin Mobile Customer Care calls. Of course, minutes are not counted if you have either the $55/month Beyond Talk plan or the $40/month payLo plan.
Without contracts you don't have to worry about who you're calling, their phone type, calling lists, weekends, night or day nor any other restrictions or gimmicks that other phone companies have.