I was considering buying a Verizon Fivespot and using it with my iPod Touch 4G so I would be able to turn my iPod Touch into a phone. So if I modify my iPod and put the Fivespot on the back, how long would it last if i got text messages throughout the day and that's it? Would it still notify me of a text message when in sleep mode or would it even go into sleep mode with the "Text-Free" app running in the background? (i'd be using the text-free app to message people)... I would greatly appreciate an answer! 