By Deepa Seetharaman SEATTLE (Reuters) – Amazon.com Incs new cellphone seeks to offer shoppers instant gratification by recognizing thousands of products, television shows and songs and allowing users to immediately buy them – on the e-commerce giants own site, of course. The smartphone, which joins Amazons Fire lineup of tablets and streaming devices, aims to stand out in a crowded field dominated by Apple Inc and Samsung Electronics . But its unclear how the phones Firefly image- and audio-recognition feature or its much-touted 3D-perspectives will work in the real world, or how fickle consumers may respond to Amazons latest bid to eliminate barriers to its core online retail business. If the device recognizes it, the user can buy it on Amazon, if its sold there.