According to Nokia Siemens, Apple’s recent iOS 4.2 update supports a technology called network-controlled fast dormancy, which essentially optimizes the way a phone interactives with networks. Apparently, this means reduced network congestion and improved battery life. Here’s an excerpt from their blog post:
With its latest iPhone iOs 4.2 software, it looks like Apple is joining efforts to cut smartphone signalling down to size. Tests by Nokia Siemens Networks have shown that iPhone iOs 4.2 supports a technology called Network Controlled Fast Dormancy, which we have already introduced into our networks. Basically, the technology makes the network and the handset work together to create the best conditions for smartphones to work quickly, yet have a long battery life and minimize network congestion.
The new Apple software release supports this way of working on networks that have the technology implemented. Nokia also implemented the technology in its smartphones earlier this year. So now the two handset makers that account for half of all new smartphones in the world contribute to an improved user experience and cost reduction for operators.
And Nokia goes on to mention that an operator in the Middle East found smartphones experienced a battery life increase from 6 to 11 hours when testing on a Nokia Siemens network that supported this technology. So far, there has been no reports of such a drastic increase in battery life for iPhone users on iOS 4.2, but do keep in mind that your network must support network-controlled fast dormancy, otherwise you likely won’t see much difference from a battery standpoint.