on how it plans to implement the throttling, provoking concerns by customers concerned about how it could affect them.

Some users, for example, have wondered whether a single heavy episode for one hour of sharing videos peer-to-peer could result in Verizon cutting bandwidth for that user. And they note that it isn't clear how much slower the network speeds would be for affected Verizon Wireless heavy users.

Any reduction of network bandwidth could interrupt a video stream, leading to delays and buffering that users might not want, experts have noted.

Some have theorized that Verizon's announcement was just a warning, and won't actually result in data throttling, partly because customers in the U.S. wouldn't stand for it.

"I am not sure Verizon will really apply [the warning]. Throttling video would kill the user experience," said Merav Bahat, vice president of marketing for Flash Networks, a vendor of software used by 45 carriers globally, including Verizon, to optimize cellular network quality.