Seems like this would apply to any cell phone really. I don't think there's anything unique about the iPhone to make it more or less suited to replace a landline than any other cell.
I personally don't use the landline in my house, though my dad keeps it for various reasons, including the fax.
However, when I was living on campus, we didn't bother to get a landline because we all had cell phones. When I move away to law school, I won't be getting a land line there either.
I have both but I only use my iPhone. My landline is only there because I need it to get my DSL. If someone tries to call my landline, they get the message that I am currently not taking calls due to the call curfew feature Qwest offers.
I heard a poll taken by CNN(i think) that said now 1 in 6 American households have no landlines and use cell phones as their primary means of communication
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