Hey guys, just had a few questions about the sensation that I just got, don't really know much about smartphones and trying to learn what I can do. I have a limited data plan because I usually have wifi everywhere, so for android apps, can I download them by using wifi so that I don't get deducted in the data? Can I also sync like facebook and twitter and google using wifi, but if I do will that use data in the backround if I'm not connected to wifi? I'm also getting double contacts after I moved my sim card from my old phone to this phone, one shows up with a blank person, and the other one shows a sim card next to it... should I delete them manually or can I do something? Thanks for all the help, appreciate it a lot.