Amazon will announce its own smartphone by June, according to a new report from The Wall Street Journal. The device is expected to begin shipping a few months later in September. Amazon has reportedly been showcasing early prototypes to developers in San Francisco and Seattle in recent weeks. The Journal also corroborates previous reports that the upcoming phone will be capable of displaying 3D content without requiring users to wear special glasses. Rather than follow the approach Nintendo took with the 3DS, Amazon's device is said to incorporate retina-tracking technology "embedded in four front-facing cameras" to achieve a 3D, hologram-like effect. Patents outlining such a system were uncovered last year. The online retailer has been rumored to be developing its own mobile device for years, but the product now appears to be nearly ready for launch. If that's the case, Amazon has been busy of late.