The basic customs Duty (BCD) on mobile phones was nil and remains Nil. The Excise duty which was earlier 1% is now hiked to 6%. When we import the phones the excise duty is collected as countervailing Duty (CVD). There is an additional duty known as Additional CVD whichs was and remains at 1%. So the total duty will be 6+1 = 7% now. On this duty you pay 3% as Education cess. The change in duty is effective immediately. I welcome to be corrected by persons having more authentic information.