A lengthy thread on Mac Rumors’ forums dating back to July 4 suggests that AT&T is at best experiencing data difficulties and at worst outright capping uploads speeds of iPhone 4 users. Many users report seeing upload speeds around 100kbps in places where they previously saw speeds of 1.0mbps and higher just a few days earlier. The phenomenon appears to be most common in major metropolitan areas, including, according to the thread, New York…
