So according to the Stevenote, 3G talk time offers half the battery life of 2G talk time...but what does that mean? Why would you talk on 2G or 3G? Since the current iPhone is not 3G and talk seems to work fine, why would you ever use 3G for talk and waste the battery? Is talking using 3G noticeably better audio quality? Is it that the entire iPhone can only be in a single G mode at once, and applies to using data services while talking?