This took me a little time to figure out. I was just in New York last week, and I couldn't get my BB to switch to the new time zone by selecting Network time. Finally I figured out I needed to select the time zone manually. This is a little tough, when I switched, it bumped all my calendar appts up by 3 hours (naturally), so I had to go though and manually change some of them back. For example, I didn't want everything to still be on Oregon time, some things I wanted on my local time in NY. So it's not perfect, but with a little work, it's not bad.