Amazon.com Inc. is planning to introduce a smartphone later this month, according to a person with knowledge of the matter, plunging the world’s largest online retailer deeper into the competitive mobile-device market. Amazon tweeted today that it was holding an event in Seattle on June 18 hosted by Chief Executive Officer Jeff Bezos for a product unveiling. The post included a picture of a black, thin device with Amazon’s name in silver emblazoned on it. Mary Osako, a spokeswoman for Amazon, didn’t return a call for comment. http://www.bloomberg.com/news/2014-06-04/amazon-said-to-be-ready-to-unveil-smartphone-to-vie-with-apple.html