Another feature has been discovered in today’s release of iOS 4.3 Beta 1 and it is very useful for iPhone users!
Users of iOS 4.3 on the iPhone 3GS/4 now have the option to change the interval of their Messages alert sound. Currently, iPhone users can toggle on a “Repeat Alert” option in the Messages area of the Settings app. This toggle plays the Messages tone twice after the initial alert, in case the user missed the first one.
With iOS 4.3, users can choose to be alerted once, twice, 3 times, 5 times, or 10 times! The Messages alerts also repeat in two minute intervals.