I have seen the post that people complain/confused to get charged for talk minutes overage due to changing a plan in the middle of the billing cycle. Say you have 200 min/ month and you used them up in 15 days. So you switch to unlimited minutes plan. What will happen to you next? You will get 100 minutes overage charges because of the proration. - 200 min/mo means 100 min for 15 days. It is showing total amount minutes under "Anytime Minutes" right now. Up to 200, 300, 500...so on. My idea is that just add prorated amount under the minutes. Up to 200 ( 6.6/day), 300( 10/day), 500( 16.6/day).... I think this will make easier to understand what proration is about when you change your plan.