What do I use my mobile phone for?

Mobile telephony -- call out and receive calls, SMS

• call in and call out
• text and multi-media messaging
• video conferencing
• face-to-face conversation
• Skype calls

A wireless net surfing tool

• browsing
• email and online calendar
• transacting & e-commerce online

Personal organiser

• to-do list
• reminder

An e-reader

• RSS feeds
• e-magzines
• e-books
• ad-hoc PDFs
• Word/Spreadsheet/PowerPoint/Project Plan docs
• photo viewing

Media center

• Listen to music
• Radio/FM tuner
• Video
• Photo viewing

Camera

• still camera
• video camera
• snapshot ability

 At last an open platform that I can either experience other people's app or building an application on it.