Change of plans
This is what AT&T tells you – using a Windows error dialog – about your rollover minutes when you try to change your mobile plan:
NOTE: By requesting a new rate plan with rollover, your accumulated Rollover Minutes in excess of the new plan’s number of monthly anytime minutes will expire at the beginning of your next bill cycle. Example: If you currently have 1,000 Rollover Minutes and you change to the Nation 900 with Rollover plan, you can only carry over 900 of your Rollover Minutes to your new rate plan. Do yuo want to continue with your rate plan change?
Not a very good way to have a helpful interaction with a customer.