Im planning to downgrade my surfmore75 to surfmore50. There will be no downgrade charges as im not bind to any contract. But how they will count my bill if I downgrade before way before my bill cycle? Surfmore50 only have 2gb but I already used 3.5gb data

Anybody have experience downgrading plan? How they count?

Yea they say they will do pro-rated charge. Do u understand what it means?

Thanks