Which smart phone is best? under 15000?

[Jack]

For 15000, you can get the brand new Nokia Lumia 620 - a Windows Phone 8 device.

It has Facebook, Twitter and Xbox built in, plus the world's best maps. It also has Nokia Music - all-you-can-eat music mixes; you can download up to four of these mixes to listen offline, and there's no ads (absolutely free). It's a really fast, and smooth phone.
It comes in beautiful colours (lime-green, blue, black, yellow, white) with a great touchscreen - and it cuts down glare from the sun too. Finally, there is a 5MP camera and plenty of apps to download from the Windows Phone Store.

The 620 is also a far better device than the 710.
In comparison to the Galaxy S Duos, Lumia 620 has a clearer screen, double the amount of storage (8GB v 4GB - and supporting bigger microSD cards) and 720p video recording (versus VGA on the Galaxy)