I just signed up for Cingular and got a Nokia 6010 with the service. I have been using my V600 because of the headset, but I wanted to see how long the battery on the 6010 would last, so I have my T-Mobile SIM in it and it has been on since I got it. I turned the phone on last Friday about noon, and it is still going with about half the battery life left! They say the battery should last about 240 hours from the Nokia website, and so far I have had it on for about 120 hours with only a few calls made and recieved. This is by far the best battery on a call phone that I have ever seen! Kudos to Nokia for doing such a good job with the battery consumption on this one!