Over the next few days, Facebook will stop allowing messaging in its main iPhone and Android apps, and force all their users around the world to download its standalone Messenger app. Facebook first started requiring users in Europe to use Messenger back in April, but after seeing “positive results” in terms of engagement, its rolling out the plan to the everyone. Facebook tells me people on Messenger reply about 20% faster, and not supporting multiple version of mobile chat will help it make both its main apps and Messenger better.

Mobile web, iPad, feature phone, Windows Phone, Paper, and desktop users can still message in their main Facebook apps or sites like before, and will be spared from this forced migration for now.

In what could be viewed as an attempt to avoid too much press attention Facebook declined to publish a blog post about the change. Instead, it’s notifying users directly, and it contacted me with this official statement:

“In the next few days, we’re continuing to notify more people that if they want to send and receive Facebook messages, they’ll need to download the Messenger app. As we’ve said, our goal is to focus development efforts on making Messenger the best mobile messaging experience possible and avoid the confusion of having separate Facebook mobile messaging experiences. Messenger is used by more than 200 million people every month, and we’ll keep working to make it an even more engaging way to connect with people.”

Some people might simply not want to worry about managing two different Facebook apps. Others might have enjoyed the Chat Heads interface that allowed message multi-tasking, so they could chat over the top of what they were doing.

But Facebook counters that people send more photos, group messages, videos, stickers, and audio clips while using Messenger. That’s supposedly means they’re having a better experience. With 200 million users on Messenger sending 12 billion messages a day, Facebook wants to unify its efforts around the app and skip out on maintaining code for a parallel version inside its main apps.