iPhone OS 3.0 preview event last Tuesday, Sir Scott explained that it was "working with carriers around the world" to build tethering support in. We can't say for sure what that means, but it certainly sounds like it'll be up to the operator to activate (or not) iPhone tethering when OS 3.0 is launched to the masses. Pocket-lint took the opportunity to ping both O2 and Vodafone over in the UK, though neither company seemed particularly interested in giving a solid answer. The former simply stated that it was "working [with Apple] to ensure new features, including tethering, are fully supported on O2's network," but wasn't "making any announcements yet." The latter simply proclaimed that it was "discussing the situation" but didn't have anything to confirm. To us, it sounds like both carriers will eventually allow it, but we aren't too sure they'll be doing so with no extra fees woven in.