Best way to test mobile latency?

[bluepeach]

I want to do a general review of mobile site speed, so it doesn't really matter if I'm testing for iOS, Android, etc. I did one test from Dulles and it was absurdly slow (slightly over 24 seconds for full load).

I would like to test from a few different locations in the US, but noticed that Dulles seems to be the only location with which I can test a mobile browser.

My questions are:
1) Is using a mobile browser the best way to test mobile latency?
2) Do I need to use the Advanced Settings and select a mobile 3G connection?
3) What does dynaTrace mean, and is it relevant to my situation?