As many of you many know the IPhone 5 is on sale at Walmart right now for $127. I called up At&t and asked them about upgrading to it and as I am eligible for the upgrade, they said if I buy the Iphone now they would prorate my bill which I DO NOT want. My question is, can i buy the phone from Walmart for the discounted price and activate it the day my billing cycle ends which occurs the first week of Feb??