I got one of the paid versions on Amazon a while back, but I ended up uninstalling it, because I was using Google Voice to send and receive texts for free, and with Juice Defender turning off mobile data while the screen was off, I wouldn't know if I got texts until I actually woke my phone up. But I decided to add Verizon's texting plan to my current one, so I ditched Voice, and downloaded Juice Defender again. Thing is, I'm not really noticing a difference in battery life, with it running, which is odd, because it does appear to turn off mobile data when the phone is locked, which is what I assumed was the biggest battery hog. So, why does my battery life seem the same regardless of whether I'm using JD or not? Does it just not work as advertised? Is there some special setting I'm missing within the app, or something? I don't get it.