Well apparently Orange has added some kind of technology to make the call quality better called "HD Voice"
Building on the success of the Orange San Francisco, the San Francisco II adds a number of innovative features, including HD Voice for clear, crisp call quality, Signal Boost allowing users to benefit from enhanced indoor coverage and Orange Mobile Mail. The handset also features the latest Android gingerbread 2.3 operating system, providing users access to Android Market Place, so they can access thousands of the latest new apps.
The quality sounds OK to me, not that much noticably different from the first gen, although I did get rid of the stock rom asap as it was way too slow.
Edited by PsYcHoKiLLa, 25 December 2011 - 03:41 AM.