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Yes, but that's means monitoring your data, which in theory is not allowed.

Hmmm..couldn't they just automatically detect Mac/PC useragent strings, without technically "monitoring" data?

Of course, even if they do do this, it's easy to fake a user agent.
 
In the US AT&T already allows tethering on most smart phones, on a Blackberry it cost's 60 USD/Month. The same cost as having a separate laptop connect card.
 
I Was expecting this, as O2 has no problem with Tethering (Aslong as its within moderation)
 
Wirelessly posted (Mozilla/5.0 (iPhone; U; CPU iPhone OS 2_2_1 like Mac OS X; en-us) AppleWebKit/525.18.1 (KHTML, like Gecko) Version/3.1.1 Mobile/5H11 Safari/525.20)

AT&T will allow this but for a monthly fee ($30). They'll be happy to make more money from you, why wouldn't they allow it?
 
Wirelessly posted (Mozilla/5.0 (iPhone; U; CPU iPhone OS 2_2_1 like Mac OS X; en-us) AppleWebKit/525.18.1 (KHTML, like Gecko) Version/3.1.1 Mobile/5H11 Safari/525.20)

AT&T will allow this but for a monthly fee ($30). They'll be happy to make more money from you, why wouldn't they allow it?

As I said above this is already an option for Blackberry customers with AT&T for the same cost as a laptop connect card. It also includes the same 5GB data cap.
 
Let me put on my resident semi-nerd hat and say I think it's technically a gateway, not a modem. :) DSL "modems" aren't even such. But people understand it better. OK OK, I'll take my hat off.

A DSL modem and an iPhone still contain a MODulator and a DEModulator so they can transmit their digital signals over radio frequencies and therefore they are a MODEM just as much as the old modems you plug into your phone line. I've never really understood why people think DSL modems are not modems. They're exactly the same - they just modulate to radio frequencies instead of audio frequencies. No real difference.
 
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