As consumers continue to blow through their $30 2-3GB usage capped 4G/LTE wireless tablet plans offered by Verizon Wireless and AT&T, Public Knowledge is repeating calls for the Federal Communications Commission to launch a formal investigation into data caps.

“It’s a ridiculous situation that the carriers sell millions of these devices specifically designed to view video on one hand, while they restrict the usage of their networks for video on the other,” said Gigi B. Sohn, president and CEO of the consumer group.

Public Knowledge is specifically calling out wireless phone companies because they stand to make millions as customers rack up usage charges when using 4G-equipped tablets with the carriers’ usage-limited wireless networks.

“It is simply inexcusable that the Federal Communications Commission (FCC) has not even seen fit to ask wireless and landline carriers to explain why those caps are necessary, how they are set and how consumers are affected by them,” Sohn added. “If the Commission is truly interested in consumer protection, it will ask the crucial questions and come up with some answers before consumers start getting hit with ever-increasing bills just for using the devices they bought in good faith.”

Sohn

Although the majority of Apple iPads sold in North America only support Wi-Fi, 4G-equipped models have proven addictive, with some customers obliterating their usage allowances with AT&T and Verizon after just a few hours of use.

Wireless carriers largely blame online video for the heavy usage.

“Streaming video consumes the most data of all possible activities and is often the reason customers are among the top 5% of heaviest users,” AT&T notes on its website.

The Federal Communications Commission’s apparent lack of interest in investigating data caps may not be that surprising, however.

In releasing the Commission’s own proposed Net Neutrality rules in late 2010, FCC Chairman Julius Genachowski made it clear he was open to new billing models that charge by how much data a user consumes.  With a green light for Internet Overcharging, carriers responded with usage limits and usage-based pricing, raising customer bills in the process.