6. AT&T

Body count: 18,401

Customer spending reductions and a deteriorating landline market caused Ma Bell to dimiss 12,000 people at the end of 2008. More job cuts would follow after AT&T's top security office leaked private information from iPad 3G owners to hackers within two months of its release. On the bright side, as of 2011, the largest mobile provider has reported a fourth quarter 60 percent profit. But with Verizon getting the iPhone, let's see how Q1 turns out.