An examination of mobile phone usage in America's ten largest cities reveals distinct preferences and trends compared to the national landscape. iOS remains more popular than Android in these urban areas, with an average market share of 64.53%, slightly lower than the national figure of 65.54%, though cities like New York heavily favor iOS. In browser usage, Safari leads, followed by Chrome, while Facebook's share as a browser is notably lower in these cities than nationally. The study also highlights a shift in cellular carrier preferences, with AT&T emerging as the most popular provider in these cities, surpassing Verizon, which falls to third place. This shift indicates a more competitive cellular market in urban areas, as seen by significant shares held by carriers like T-Mobile, Sprint, and MetroPCS.