I used to leave it in 4G all the time because I've always had a good signal but lately I tend to just leave it in 3G. I get better battery life and don't notice the change in speed when using email, sms, tapatalk, or even streaming audio. If I have to download a pdf or a rom or some big file or watch streaming video I switch back to 4G
BTW, I get better battery life on 3G than on wifi.
BTW, I get better battery life on 3G than on wifi.