Amazon has the newly released Motorola Atrix 4G dual-core Android smartphone on AT&T for $149.99 ($699.99 unsubsidized, 499.99-350 instant savings carrier subsidized) with Free Shipping for a limited time when you opt for a new 2 year service agreement or renew your existing contract.

Motorola ATRIX 4G for AT&T offers a 1 GHz dual-core processor and the ability to connect to AT&T’s ultra-fast 4G mobile broadband network. Powered by the Android 2.2 platform, it also features Motorola’s webtop application, which offers a PC-like experience and runs a full Mozilla Firefox 3.6 browser with support for Adobe Flash Player when using the optional dock.

With AT&T’s 4G network, you’ll enjoy mobile broadband speeds up to 4x faster than AT&T’s already fast mobile broadband network (learn more below). You also get the optional AT&T Mobile Hotspot service built right into the smartphone–enabling you to connect additional Wi-Fi-enabled devices to the phone’s mobile broadband signal.

The NVIDIA Tegra 2 dual-core processor (2 x 1 GHz) allows you to multi-task quickly, while the 1 GB of RAM provides PC-like power and performance. The 4-inch qHD touchscreen display offers a rich 24-bit color depth and a 960 x 540-pixel resolution for extremely sharp images.

Other features include a 5-megapixel camera/camcorder that can capture video at HD 720p resolution, ultra-fast Wireless-N Wi-Fi networking, Bluetooth for stereo music streaming and connecting to peripherals, 16 GB internal memory, microSD expansion (up to 32 GB), MOTOBLUR for integrated social networking, GPS for location-based services and navigation using Google Maps, HDMI audio/video output, and up to 9 hours of talk time.