Here are some useful mobile application for your mobile phones:

1. OPERA MINI 4 put the full web on your mobile phone.
Opera Mini 4 enables you to take your full Web experience and digital lifestyle with you — everywhere you go. Whether you want to access your mail, RSS feeds or bank information, Opera Mini is fast, safe and secure. Opera Mini 4 delivers several new features for quicker scrolling, navigation and page rendering. Opera Mini 4 is free, so download it now!
To download Opera Mini directly to your phone, please visit operamini.com using your existing phone's Web browser.
http://www.operamini.com/download/

2. BING ( MESSENGER) www.bing.im
bing is the cheapest messenger so and the fastest
Your friends are always close
– in your FREE SMS room!
* chatting with multiple friends at the same time – online or offline
* your own personal mobile SMS room just for you and your friends
* fun emoticons to show your mood
* ICQ, MSN, AIM, GTalk, Yahoo contacts on your mobile
* NEW: Mobile Entertainment anytime and anywhere - quiz, jokes and quotes FOR FREE!
* NEW: Free photochat to show your friends where you are and what you look like ;-)
* up to 800 bings for the price of 1 SMS
Download; http://www.bing.im/en/download/bing-download-for-free.html
It's a FREE download from the WAP site (http://wap.bing.im) or get the file from the website via your PC.