The U.S. Federal Communications Commission (FCC) said Wednesday it would fine AT&T $100 million US for slowing down traffic for customers on wireless plans touted as being "unlimited." The FCC said in a press release that an investigation found AT&T "severely slowed data speeds" for these customers without adequate notification. It said AT&T started offering unlimited data plans for mobile service in 2007. It said that while it doesn't offer such plans anymore to new customers, existing customers are permitted to renew their unlimited plans....