Some subscribers of Verizon Wireless' unlimited data plans can experience slower data speeds beginning October.

Three years ago, Verizon established a "network optimization policy" that aims throttle the internet traffic of its heaviest 3G subscribers. The policy will now include unlimited 4G LTE subscribers who rank in the top 5 percent of data users.

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This move will give them slower speeds depending on which applications they use starting Oct. 1.

Activities like streaming high-definition videos and real-time online gaming can slow down user transfer rates. It's to be noted, however, that subscriber's speeds will only be choked when the cell site their device uses is hit by heavy traffic, said Verizon.

Government organizations and businesses that have signed a major account agreement on internet connections are exempted from the reduction of data transfer speeds.

Customers of the 4G LTE data plan that exceed the 5 percent data threshold of 4.7GB as of March and new subscribers will be affected by the new policy. Those who currently have contracts are excluded, said tech website, The Verge. 

This situation benefits subscribers who are under contract. Users exploit loopholes to extend unlimited data plans, extensions that are technically no longer possible.

Verizon seems confident that a majority of users won't notice problems, said The Verge.

"But if you're one of those crazy people using an unlimited Verizon data plan as a substitute for cable internet - yes those people exist, and Comcast loves them - it may be time to start researching alternatives," said Chris Welch of The Verge.

"Anyone still holding onto unlimited data at this point is doing so for a reason. Starting in October, you'll need to again weigh whether it's worth the cost."

Mike Haberman, vice president for technology at Verizon, said the company understands subscribers who depend on their tablets and smartphones every day.

Tags4G, 4G market, verizon, Verizon wireless, Data transfer