Wireless internet connection question?

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I just got wireless internet for my laptop with tmobile. I got my bill this month and it says I have two lines on my account, which I thought was a bit odd. I'm assuming one is my cellphone and the other my internet connection? I didn't think the internet connection would show up as a line. Is it supposed to?

[CB]

If you have a 3G connection, or any other type of connection on your phone it will turn up as a line, this is because that even from your phone an internet connection is represented as a line, no matter what.