Did you turn Home Sharing on? I did and I noticed a smaller amount of battery drainage so I'm doing a dfu restore to see if it helps. At the end of the day I'd be at 75% and now at 1pm I'd be at 75%. So seeing if this helps at all.
Restored, Restored to new, DFU Restored, disabled everything, my usage and data usage slowly creeps up all day, and Apple no longer sign 4.2.1... makes me sick, why did I ruin my iPhone
Never update right after an update comes out. Learn from this.
I thought 4.2.1 was still being signed?