How many people have the issue where they call CS, Voicemail, or even regular calls sometime, and your phone WILL NOT HANG UP. Usually this is because the Phone Application disappears.
This thread addressed a supposed fix, and may or may not help, but it is no solution.
HOW MANY OF YOU HAVE THIS PROBLEM????
**UPDATE**
It seems to be a pretty common problem (at least with happening occasionally).
Please try to raise awareness to sprint by shooting them an email at
ecare1@cc.sprintpcs.com Will take very little of your time but could impact us! They will be releasing a new ROM at the end of the summer with WinMo 6.1, so hopefully this can get included!