Just upgraded my iPhone to the 4G. I figured that iTunes would let me log in and download all of my paid apps without charging me again. I am 100% using my same iTunes account. I have logged in on my new phone, but when I search for an app I have previously paid for, instead of saying "Install" it shows the price and then a "Buy" button. I'm hesitant to test it out as I don't want to be charged for the apps I've paid for. I still have my old phone with the apps on it and tried backing them up on my new PC but apps didn't transfer. If I choose to "Buy" one of the apps I have already purchased is it really going to charge me again or is it just showing this interface because it's new hardware that hasn't previously recognized the app as being purchased?