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They don't allow you to backdate smaller plans because it would potentially create a huge bill with crazy overages due to prorations in data
for instance if you had a 5GB plan, and made it effective with only 7 days left in your cycle in September which had 30 days you would only have 1.17GB for the rest of your cycle.. (5GB/30days) x 7 days left in cycle...things like that.
