No software update button for my Iphone 4.
Hello, I just bought a used Iphone 4 from Verizon today. I wanted to download the facebook app and when I went to do so it told me that i would need to download the iOs 4.3. At that point I looked through it and asked a friend that also has an iphone 4 and he said to look in the Settings > General > Software Update. I did that and could not find the software update, I then looked through everything in the setttings and could not find it. Am I missing something or is it really not there?
iPhone 4, iOS 4.2