I'm over my data plan usage. How much extra do i need to pay

It says i'm overage:156 on the data. But before i went over i got a text saying i was charged another $15 for another 200MB but i'm trying to make sure because i don't want to be charged a lot and this is an iphone 4s

Stop spending so much money pn a phone. Get an android from dollar general or walmart and pay 50 buck every month… No overage charges.

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