So I have a signal booster router from Sprint at my house which means I have 5-6 bars (full service 3G) basically 100% of the time, but I also have wi-fi... now if I have on my wi-fi on my phone, but I also have 5-6 does that mean the wi-fi is draining my battery and I should turn it off because I already have full service? Thanks, any help is appreciated.