So this rumor might come as a shocker and customers may throw fits if it points true. CrunchGear received some information about the cost for tethering on the iPhone. No, it's not like some small add-on fee for $9.99, but it may come out to somewhere around an additional $55 per month on top of an existing data plan. So in reality, you'd be dishing out $85 over your voice plan just to have the capability. That figure may sound a bit too astronomical in size and may turn some people off from getting it. Sure all that money will probably go to a good cause like network upgrades to increase service around the country. But it's still a big price to pay – it's almost just as much as paying for three data plans. Let's hope that AT&T comes to a happy medium to satisfy everyone.