I've got a an old plan $40/M 300min and 300 meg. I've got $25 left on my tab. My billing cycle ends on the 10th of the month today is the 18th. I'm looking at switching to the new $50 plan 500 min and 2GB data. I understand that I have to pay off my $25 tab. My question is what is this proration and how much is it? If I change my plan today do I instantly have 500 min and 2GB data to use up to the 10th of Oct ? I'm assuming I can do this in self-serve but reading responses on other threads for the last hour hasn't cleared things up.