It appears to only be affecting iOS devices, as Android devices remain operational.
The problem has led many of the world's biggest apps, including Spotify, to crash as soon as they are launched.
"Something’s out of tune," Spotify's Status account said. "We’re currently investigating, and we’ll keep you posted here!"
Workarounds include going to Spotify's web player, or using Airplane Mode before opening the app.
However, users will only be able to play downloaded music, rather than content streamed from the internet.
The New York Times app, Hinge, Fitbit, Twitter, Strava, and Snapchat all appear to be affected.
Uninstalling and reinstalling the application does not fix the issue, companies have warned.
Facebook confirmed there was a problem on its status page, intended for developers.