Although a slight change in the manner of how much text was involved, the implications are nothing small. After launching a good deal for discounted Netbooks, AT&T have updated the “Prohibited and Permissible Uses” section.

The new terms of service explicitly state:

Downloading movies using P2P file-sharing services, customer-initiated redirection of television or other video or audio signals via any technology from a fixed location to a mobile device, Web broadcasting, and/or for the operation of servers, telemetry devices and/or Supervisory Control and Data Acquisition devices is prohibited.

What does this mean? The short version is that you might not to able to stream content from third-party Web sites, such as You Tube. This may go as far as not being able to freely use video-streaming applications, such as Slingbox (both the existing Windows Mobile and upcoming iPhone versions [pictured]). One thought is that AT&T is now treating its 3G wireless data network differently from its wired high-speed DSL network, which still allows you to do whatever you want. This is may be because the company does have to pay for the wireless spectrum, in addition to other investments.

The other modification is that, you will not be able to carry your unused data to the next month, at least those on DataConnect:

On the 5GB DataConnect Plan, once you exceed your 5GB allowance you will be automatically charged $0.00048 per Kb for any data used. On the 200MB Data Connect Plan, once you exceed your 200MB allowance, you will be automatically charged $10 for an additional 100MB. Unused data from either your initial allowance or any overage allowance (e.g., the 100MB) will not be carried over to the next billing period; all data allowances must be used in the billing period in which the allowance is provided.

The changes only apply to cellular data plans. It seems that streaming through WiFi (provided your phone has the feature) is not effected.

[via Crave]