 For the cost of viewing an ad, users can get free video clips.Verizon Wireless and Sprint Nextel Corporation announced as late as 2008 that they would allow some adult content to be viewed on their networks, while working to prevent access to this content by children.There have been expectations for some time that these companies will overcome age-verification, political, and religious challenges that have become a barrier to this market, to take advantage of the resulting increase in mobile web-surfing on their networks.