How 2 delete the unwatanted application in iphone..??

Use installer. But for apps that came with iPhone such as Weather, Notes, and so on....you need to be able to access the files on your iPhone. Using Windows, get iphonebrowser to do tat. But i strongly discourage deleting those built-in apps.

yup, just hiding the built-in apps is good enough. btw i forgot where the app source, but u can download Who Needs iTunes Store or Who Needs Stocks if u wanna remove these iTunes Store and Stocks. but of course it will be backup-ed.