Verizon Wireless will finally be joining AT&T, Sprint and T-Mobile with carrier billing support for purchasing apps, in-app purchases, movies, music and books through the Google Play store.

Carrier billing works by directly charging a user’s monthly phone bill for purchases, rather than requiring a user to supply credit card information.

Google tweeted yesterday that Verizon Wireless will be adding carrier billing for the Google Play in “the coming weeks.”

Although earlier studies from Distimo and Flurry reported Google Play monetizes at a far lower rate than the iTunes App Store, that appears to be changing. Earlier this month App Annie reported it Google Play had seen 137 percent revenue growth in the first seven months of 2012, a report backed up by several developers. With all four major U.S. carrier now on board through carrier billing, the monetization prospects for Google Play are continuing to improve.

Google Play now has more than 675,000 apps in its app store. According to statements made by Google CEO Larry Page during the company’s Q3 2012 earnings call, 1.3 million Android devices are activated every day.