Which is the best browser for nokia windows phones.

Hi friends, I am the new user of nokia phone. Currently, I am having nokia phone with me and I want to know that which the best browser for my nokia phone is. Is it Opera mini ? UC browser ? nokia browser ?

Is it possible that unlocked iphone5 ?

Friends please assist me out. I am planning to purchase iphone5 from US (United States). If I purchase an unlocked handset will it work satisfactorily in India or anywhere in world? I mean say that it will work or acceptable with network provider….Please help me out…