I accidentally sent a text message to a caller today when I was already on another call. That's a cool feature and I'd like to use it, but I'm not sure how it happened?!! I found the option to change my outgoing text message under my settings, but now I just need to know how to use the feature. I tried it a few different ways with my son calling me while I was on another call, but I ended up dumping him into voicemail instead of sending the text message. Any help would be greatly appreciated. Thanks.