Amazons mystery unveiling Wednesday is widely expected to be a smartphone, which if managed well could shake up the market and boost the US online giant as a device maker. The company has given few hints, inviting a small group of media to the event to be hosted by Amazon founder and chief executive Jeff Bezos. The announcement contained an image of what appeared to be the edge of a smartphone — a device long rumored to be in the works by the Seattle, Washington firm, which is a retailer of a multitude of goods and digital content. If it is a smartphone, Amazon would automatically be considered one of the top players before it even ships its first phone, said Gerry Purdy, chief mobile analyst for Compass Intelligence.