My daughter has a Charge that went haywire during a voice call and started making a loud siren sound for about 5 seconds then the call terminated. The phone was not frozen, and did not power cycle. The phone returned to the home screen and functioned ok after the event. I powered off the phone, took out the battery for 10 minutes then reinserted and powered on, and it seemed to be ok. I called tech support at VZW, and they said they never heard of it before, tried to duplicate but couldn't, and of course blamed it on an app. I understand it could be an app, but this seems to be a stock answer when they can't find anything wrong . Have any of you Charge owners ever experience this problem with your phone. The sound almost sounded like a phone dialing a modem (???)