AT&T Locker is a cloud-based media storage service. Available for Android, Windows, and iOS environments, it lets you store, sync, and share your media from any internet-connected device. The service also allows you to access your content through a web browser. It's easy to share your documents, photos, and music with anyone. You can also view your content from anywhere, so you don't need a mobile device to get it.

While the service was unique to AT&T mobile devices, it was never popular enough to win many users. While it was attractive that AT&T was concentrating on mobile content, its lack of new features and the poor user interface discouraged many users. Despite its streamlined interface, users felt that the service lacked features and didn't stand out from similar apps from Google and iCloud. Ultimately, the service failed to capture the attention of consumers.

AT&T Locker offers its customers free cloud storage space. However, the service doesn't support Apple's iPad or the iPhone 5's taller display. Nevertheless, it allows users to upload photos and videos to secure online storage. This service lets you create customized albums and store music, so you don't have to worry about data caps. And because it's free, you won't have to worry about paying for data plans.