The plan will resemble the BlackBerry tethering option on AT&T whereby interested customers will have to pay an additional $30 per month on top of the $30 monthly charge for iPhone data access with a couple of caveats.
The first is the 5GB hard cap which will be closely monitored, and unlike the BlackBerry plan will not allow for a per megabyte overage with tethering being disabled until the next billing cycle if and when the cap is reached.
The internal engineers even suggest to wait until the next billing cycle in order to add the feature, as the proration will invariably cause billing issues. The option to roll in tethering access to new iPhone plans is being considered but nothing has been confirmed.
The second major exception is the as yet unconfirmed iTunes activation requirement in order to use the service, or the second option being considered in a one-time feature activation for the life of the account with varying speeds depending on network type and availability.
The engineers also confirmed what was previously reported on in regards to AT&Ts little-known QoS implementation with anyone requesting unlimited data access to purchase an aircard instead of relying on iPhone or 3G phone tethering which is capped along with having significant overage charges.