Best Buy is offering $50 off the iPhone 5 or iPhone 4S Smartphone for AT&T, Verizon, or Sprint with two service agreement for a limited time. Shipping is free. Deal expires January 5, 2012.

The iPhone 5 features a 4″ Retina display, the powerful A6 chip, an 8.0MP iSight camera with panorama and 1080p HD video recording, ultrafast wireless, Siri, iOS 6 and iCloud. Yet it’s the thinnest, lightest iPhone ever.

The iPhone 4S is powered by Apple’s A5 dual-core processor and features an all new 8-megapixel camera which is capable of recording 1080p HD video at 30 fps with image stabilization. It’s also the first phone to intelligently switch between two antennas, so call quality is better and it doubles the maximum HSDPA data speeds to 14.4 Mbps. It runs the new iOS 6 with iCloud effortless, and seamless backing up and managing your data wirelessly. It also features AirPlay Mirroring, Siri voice-activated intelligent assistant that helps you get things done, and much more.