Your add-on starts once your monthly allowance is used up. If you buy a data add-on, it starts being used after your monthly data allowance and Data Rollover are used up. A 200-minutes add-on starts once your monthly minutes allowance expires.
Make sure you buy the add-on when your allowance is close to running out. A 7-day data add-on will expire exactly seven days after you bought it, not seven days after it starts being used.
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