And I am shocked to say that ios 4 on iphone 4 laggs pretty bad and by lag I mean even the tiniest lag possible, I compared this iphone 4 with mine, iphone 4 16gb on ios 5.0.1 jailbroken and I have to say everything was faster on ios 5 than ios 4: opening apps, safari, animations were skipping some frames, itunes store was really slow. I did a downgrade with blobs and I did a hard reset, I turned on airplain mode and still laggy. I am really disappointed about ios 4. My iphone 4 came too with ios 4.3.5 but I was so excited about it that for a while I didn't notice anything and than I updated to ios 5 and completely forgot about ios 4.It seems like Steve Jobs created ios 5 really good for older devices like iphone 4. So my question for you is: was your iphone 4 laggy on ios 4 ?