See the Calculations
Data usage varies by device; smartphones and mobile broadband devices may use more data for email and applications. We used these averages to do our calculations on each type of data transfer: music streaming 1 MB/minute; video streaming 4 MB/minute; photo uploads 350KB/piece; and apps & games downloads 3MB/piece. Calculations of data usage are estimates only; actual amount of data used may vary significantly. © 2013 T-Mobile USA, Inc.