All plans?The big byte top up is valid for 12 months, after you finish your monthly 100GB, the 750GB quota kicks in, lets say this month you consume 50GB of that, 700GB will get carried over. After your 750GB is totally consumed, then the FUP for your plan will kick in. They don't mention FUP, but if I am not mistaken, it is 1Mbps for all plans now, someone could correct me if I am wrong.
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