“If i use up the 40GB in less than 30 days, can I just add a new card or do I have to wait until the end of the 30 days before I add another card?”
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If you are going to need it consistently, you can add it before the upcoming expired date. Keep in mind, it does not roll over. So even if you didnt use all 40gb, it only covers for 30 days & you would need to buy another 40gb .
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