At first, I thought it was my imagination. Around the time the iPhone 5S and 5C were released, in September, I noticed that my sad old iPhone 4 was becoming a lot more sluggish. The battery was starting to run down much faster, too. But the same thing seemed to be happening to a lot of people who, like me, swear by their Apple products. When I called tech analysts, they said that the new operating system (iOS 7) being pushed out to existing users was making older models unbearably slow. Apple phone batteries, which have a finite number of charges in them to begin with, were drained by the new software. So I could pay Apple $79 to replace the battery, or perhaps spend 20 bucks more for an iPhone 5C. It seemed like Apple was sending me a not-so-subtle message to upgrade. Read full article in the NYTimes.