I've seen in hear that you can tethering your phone but not use your phones internet connections as a modem. Isn't tethering using your phones internet connection so you can use that same internet connection on your computer? Will I be able to use my phones internet connection on my computer? How does this work, does it just depend on the phone you use, I have a unlocked iphone 4. Please help cause I'm wanting to switch over to ST but want to be able to know what I'm getting my self into.