do you get charged for using t-mobile's wifi hotspot app? I want to use it to connect my iPad and iPod touch while I'm on the go, (in the event I ever even need to), but I don't want random new charges appearing on my phone bill. right now, I pay 60 dollars a month for unlimited data and web and 500 calling minutes. can I use their app free of charge, or will they charge me for using it ? Also, will I be charged for using tgere t-mobile tv ?