Opera Mini and Opera Mobile.

Browse the internet with ease in your 5530 XM using the latest Opera Mini and Opera Mobile browsers. Opera boasts the fastest browsing experience for your phone plus save money on mobile data by taking advantage of their latest compression technology.

Personally, i prefer using Opera Mini over Opera Mobile since I usually connect to the web through wi-fi.



Here's the link to Opera's official website. 
Here's a review from laptopmag.com.