T-mobile prepaid now comes with the option for unlimited nights. If you are a prepaid user, and have selected their "pay per day plan" ($1 per day for $0.10 calls), then you also get unlimited nighttime calls (7pm-7am).

If you talk a lot, then this really is a sweet plan, unlimited calls for a buck is pretty impressive, and even puts current postpaid users at a disadvantage (who only get 8pm nights).

The $1 charge only applies to days you actually use the phone, but has the disadvantage of not being eligible for the T-mobile prepaid gold rewards, nor can it be added to a Sidekick prepaid plan.

You can read all the fine print here.