You want to understand the "must have wifi"? I have no coverage at my house. I can get in my car and drive down the road and get coverage, but at my house it's like a wireless black hole because of the geography. So if I want any coverage at all I HAVE to have wifi and if t-mobile offers hotspot@home could I receive calls at my home and potentially replace my telephone connection with my cell phone. That's why I "must have wifi".
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