gotta disagree with you vehemently. NYC is pretty bad. I work in times square and the signal outside is okay, but indoors, it's hit or miss. I also have an AT&T blackberry for work and that always has a signal even when the iphone 3g signal is dead. On really nice days when all the tourists are out, the 3g signal outside is even worse. There are days when the signal is just crap. It's not just me, i have quite a few coworkers with similar experiences. In fact, I do believe at one point it was so bad that i heard they stopped selling iphone 3gs in nyc.
honestly, I have not seen any improvement in the service yet and this coming from someone who's had the iphone from day 1 of iphon 2g. With that said, I hardly talk on my mobile, so my primary use is for the apps and such but sure would be nice to have a decent connection or A connection when one is needed.