I downloaded an app called PhoneInfo. I have a question about the choices when you bring up the phoneinfo app. Opt 1 (CDMA auto (PRL)) seems to be the one to swich to 3G with phone on. How do I get back to 4G. I used Opt 5 (LTE mode) and that worked; but I thought it was on Opt 4 (CDMA +LTE/EvDo auto) originally. But when I pick Opt 4, I get nothing? What has been anyone else's experience?