My thoughts on wifi were that it's for people who don't have unlimited data plans, to save $ on data usage and reduce the risk of going over your data plan usage...am I correct? Or is it a battery saver? I have all of my wifi off, I don't want my phone searching for wifi, I feel like it will kill the battery faster. But will using wifi when available, instead of the network, save the battery instead? I'm just a bit confused, only been a smart phone owner for 4 days now, lol.