Which DNS's are you using?

I wrote some time ago an article about DNS (domain name system), what it does and why you should choose a good one, article that can be viewed by clicking here. So, I'm interested about your preferences about DNS's. Below is a poll where I invite you to vote into.

What OS are you using on your phone?

With so many mobile OS's available, I'm really interested to see what are my readers using on their phones. So, please vote! :)

p.s: I'm using iPhone OS.