What is the best mobile OS on your own opinion?

You would probably get a lot of diverse answers to this! In my opinion, Windows Phone 7 is the best mobile OS. In contrast to market sales of smartphones (it being the smallest, although newest). In comparison to iOS it is more modern and not a static stream of apps. The android OS doesn't look very visually attractive and the open nature of it, although a good idea, has led to a sort of non uniform set of phones, some of which fall below the latest smartphone standards but still carry the Android platform with them and hence the smartphone tag. Google OS is not for mobile phones, more towards netbooks. I know I am going to get a lot of disagreement on this, especially my iOS comment as you might have noticed Apple has fans, not customers. Blackberry would be my second pick, it has it's features and maybe I wouldn't put it in direct competition with today's phones. I could express that saying it is the most phone-like OS of all, all the others basically media devices with phone call capabilities. Windows Phone 7 is really a rough diamond. It is not very popular and I don't know how I would convince you it is the best, but in my opinion it is.

Android by Google already established its supremacy by surpassing them all, including iPhone iOS and the former #1, Nokia's Symbian. The Android Market is poised to dethrone Apple's app Market in the next few months.