I'm in the midst of transitioning from a galaxy s2 to an iphone 4. After having used a few android phones over the years, the superior iphone battery life is one of the biggest differences I've noticed so far. Granted, I haven't used it much for voice calls yet, but been playing some music and using data on and off (browsing, fb, etc) and I am AMAZED at how long one charge is lasting me. Even on standby, I don't think my galaxy s2 ever went over 24 hours on one charge. The iphone is at 85% after 22 hours of being on. Again, it's been on standby for much of this time, but still - none of my old android phones had anywhere NEAR this kind of life.