I bought my iPhone 4 16gb from singapore befor 3-4 months. I am using it from first day now it shows 25gb free memory i cant understand how is it possible??? In itunes it shows 16gb but in windows explorer it shows 3.9gb used and 25gb free storage capacity. Is my iphone 4 16gb is actually 32gb?? What should i do to gain full 25 gb memory??