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This $100 Prepaid Refill Card can be used for a monthly plan or for Pay As You Go.
You sure?
It can be used on a postpaid plan?
It cannot.
It can be used on a monthly prepaid or on a pay-as-you-go / pay-per-minute(/day) prepaid.
Prepaid cards will not work on postpaid accounts. Stupid but that's the way the system is.