Tethering
It's been my experience that if you have a wifi capable device, it will pair with a tether enabled phone, the same way it will see a wifi router.
The problem comes in when your carrier detects an unusual volume of data. I jailbroke and enabled tethering on my iPhone 3G earlier this year. I have an unlimited data plan with ATT. Nevertheless, after 3 months of downloading over 3 gigs of data a month, ATT sent me a letter and an email telling me that it suspected that I had been utilizing tethering without enabling their tethering plan (which, by the way, is not unlimited) and that they were going to unilaterally end my unlimited data and enroll me in their tethering plan. I didn't need to tether any more at that time, so I un-jailbroke the phone and claimed that I didn't know what they were talking about. That ended the issue.
If you have Verizon - you can expect worse!
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