Verizon - when changing your data plan during the active cycle, which choice would be best? the?

... backdate, immediately, or next bill date? we need to have more data before the end of our cycle, and i want to chose the best one that will not c

... backdate, immediately, or next bill date? we need to have more data before the end of our cycle, and i want to chose the best one that will not cause to much problems

or:... backdate, immediately, or next bill date? we need to have more data before the end of our cycle, and i want to chose the best one that will not cause to much problems

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