Announcements with iPhone 4 UK price details kept popping up last week like costly mushrooms with Orange, O2 and Vodafone all showing their hands. Three has confirmed that it will be the last of the remaining networks to reveal its iPhone 4 deal and it looks like it could be holding an ace – free tethering! Intrepid phone sleuths have got their hands on a Three carrier update and free iPhone 4 tethering evidence is lurking within it…

3G Forum member DBMandrake went delving into the iPhone 4 Three carrier update and discovered that tethering is configured automatically. He claims: “It should work with no special data plan…in fact, they won’t be able to tell apart the phone and tethering data use.”

If he’s right, that would mean the Three iPhone 4 packages will undercut the other networks by offering free tethering as part of its standard iPhone 4 data deals. So far the other iPhone 4 carriers are charging extra for the service so it could be Three’s killer offering.