T-Mobile's looking to expand its prepaid offerings, branching beyond the typical minute allowances to offer its new "Pay By The Day" service which -- you guessed it -- charges for service by the day. One dollar per day, to be exact, nets you unlimited nighttime calling and unlimited calling to other T-Mobile numbers, while other calls will run you 10 cents per minute. At the end of the day, you're shelling out $30 a month on average for the ability to yap until you're physically unable to speak any longer
, as long as you don't call out of network during daylight hours. For night owls, this could be a boon.