I have a few questions on Wifi and Sprint network connection settings. 1. why is wifi less power consumption on battery? 2. If I use a widget to turn on wifi; will it automatically turn off the sprint network (3g / 4g)? Or do I have to turn one on and they other off each time? 3. I tried Y5 at home... I can see it jumping back and forth from wifi and EVDO dont know if this makes a difference... I have the HERO, but working to get the EVO.