AT&T (NYSE:T) announced a major win Monday, confirming that General Motors (NYSE:GM) has given it the contract to service its wireless OnStar safety, security, diagnostic, and infotainment service available in Chevy, Buick, GMC, and Cadillac cars and trucks.

Previously, Verizon (NYSE:VZ) Wireless (jointly owned by Vodafone (NASDAQ:VOD)) had provided the bulk of the infrastructure for this franchise, but beginning in 2014, it all switches over to AT&T.

In a press release, AT&T noted that this is a "multi-year agreement" servicing "millions of GM cars, trucks and crossovers with 4G LTE mobile Internet access." The new suite of services AT&T will be providing to OnStar subscribers will include not only streaming audio, but also Internet access, apps, and video for backseat passengers. AT&T said it will also be offering Wi-Fi hotspots and voice-activated calling in GM vehicles using OnStar.

Financial details of the contract were not disclosed.