[SexyReddMogul]

I've had this problem numerous times. I don't use the WiFi mode & it was never on & the "will not end call" has happend to me & my co-workers (2) here & there. Sprint will jus tell you to do a hard reset & I have. It does fix, but the problem does still occur. Not as much anymore though. I notice it does it more often when i'm "working" from my phone. Being a high end user. On the days that i'm not a high end user of apps/ calls/ emails & text - 5-6 hrs heavy- it does not lock up. So maybe that helps. Now instead of hard resetting - i just plop out the battery & its fine.