Even though I do not have any iPhone, I am reading all the news and discussions in the forums about this new toy. I am not into all the nice features, I am more looking into the battery issues. There are a lot of helpful advises how you can save energy on the new iPhone. Here I list some of them

- Do turn off WLAN

- Do turn off Bluetooth

- Reduce the brightness of the display

- Do not check too often your email

- Switch of 3G and use 2G instead (so why was there a 3G iPhone at all?, yes the GPS stuff!)

and here my personal advise

- Do not switch it on at all (operational time -> infinity).

Even though I have to admit that battery issues are not limited to the iPhone, I am quite happy to read all about it and use it for my students to explain why we need to work on energy saving strategies at all. As my research area is on energy saving mechanisms, the iPhone is a very good example. Steve Jobs made a very clever statement referring to the 3G chipset as power hogs. At that time he used this as an excuse why there is no 3G chipset on the devices. If you look at  http://www.apple.com/iphone/specs.htm, you can see that APPLE states, that the talk time for 2G is twice as high as for 3G. The GPS chipset is switched off automatically if not needed, but the 3G can only switched off manually.Therefore I changed the slogan of Apple "Twice as fast - Half the price" to "Twice as fast - Half the battery"

So whatever the 4G technology will be, as you should rarely use 3G, 4G you should never use if you care about battery. So long, I need to read more about it, very good motivation for my daily work.