An update (I have AT&T)...when the crowds were really concentrated, I had a lot of trouble with the data network. On Saturday evening, while waiting for the fireworks at Jolly Holiday, I could not do anything that needed a data connection (e.g., Twitter, Facebook, etc.). I was able to get text messages without any problems (didn't try calling). Once the fireworks ended and the crowds thinned out, I was able to use things that needed data. So, just something to keep in mind for busy times/locations.