I can get abuot 30 minutes more juice out of my phone with 3G turned off. It is way easier on your battery. I am getting between 16-20 kB/s EDGE speed which is great for the apps and fine for browsing. It's also EDGE which is unlimited. 3G i get up to 5.6mbps (3 gigabyte limit). I live in Thailand and the 3G coverage is "limited" coverage. Exactly as explained by Apple, and it really works. I turn it on if I am downloading an App, the EDGE is slow due to high peak hours, or if I am tethering. So, really take a look at Advice by Apple really works.