Update your iOS 4.2, and get iOS 4.2 beta 3 with more SMS tones for iPhone
Apple inc always try to change there users mood by introducing new features in iOS ,for the last 6 weeks is was 3rd upgradation for iOS 4.2, are you satisfied with apple developers??? surely i am :) iOS 4.2 Beta 3 characteristics
Fix Several Bugs
New enhancements in multitasking( surely you will love it)
Add-on more SMS tones to select specially for the iPhone users.