The Christmas shopping season is the time when the top four U.S.-based wireless operators Verizon (NYSE: VZ), AT&T (NYSE: T), Sprint (NYSE: S) and T-Mobile spend the most money on advertising and add the most subscribers. Their campaigns come at a critical time. A new comScore study forecast that this year's "Cyber Monday" after Thanksgiving will be the heaviest online spending day, rising 20 percent year-over-year to around $2 billion. Phil Goldstein, editor of FierceWireless, chronicles the way each of these Tier 1 wireless operators are going to focus their advertising campaigns. Read more
