Sprint debuts its eco-friendly on Earth Day, and claims that it is one of the most environmentally considerate phones available. The phone runs the Android 2.3 (Gingerbread) operating system, and includes near-field communication (NFC) support, an 800MHz processor, 3G connectivity, and 5-megapixel camera. It retails for $30 with a two-year agreement after a $50 rebate.

But that's not what will make environmentalists heart flutter: the phone itself is made of 50 percent recycled plastic and does not include ecologically harmful materials such as PVC plastics, phthalates, halogens, or mercury.

Verizon Wireless won't release a phone on Earth Day, but boasts the fact that 75 of its retail stores have received "green" certifications from the . These stores use a variety of strategies to reduce its environmental footprint.

The carrier says these green stores use Energy Star certified equipment, employ energy management systems to conserve energy, use low-flow toilets and plumbing, and use environmentally friendly finishes and materials in the store's construction.