The top three most popular paid ad networks, Foxtell and Adblock Plus, will be free from ads starting Thursday.
The top three paid ad providers will also be free on Tuesday and Wednesday.
Foxtelly, which was recently acquired by Google, will offer free ads to all its users starting Thursday, while AdblockPlus is free on all platforms.
On Thursday, Google will launch free ads on Google Play and the Apple App Store for the first time.
The free ads will run on Google News and Google+, Google+, YouTube, Google+ Hangouts and Google+ Messenger.
Free ads will also appear on YouTube, YouTube Music, Google Play Music, and Google Play Games.
In a blog post, Google said that free ads offer more targeted ads and more choice for users, with the result that people will be able to decide if they want to opt in to some or all of these ads.
Google also noted that this is the first such experiment in the U.S.
Google says that its experiment is aimed at increasing choice for people who use their smartphones and tablets to watch YouTube and other popular content.
Google has previously experimented with ad blocking and other content filtering on mobile devices.
In 2015, the company rolled out an ad blocking program on Android smartphones and other Android devices.