Am thinking about going to a smartphone , which one do you kool kids like ? I would like good battery life, 4G ,andonid. What is Icecream sandwich and Jellybean -op all about ? The phones am looking at are Pentech-flex & Burst or Samsung- Galaxy S II / III or Galaxy exhilarate -am going with these because an cheap ,the phones are free, $.99 or $29.99 and have good reveiws .