To date, iPhone 14 owners haven’t been able to use Trueplay to tune their Sonos speakers because the Sonos app hasn’t supported it. Trueplay has been “coming soon,” but until recently, you needed an iPhone 13 or earlier to use Trueplay (which doesn’t work with any Android device.)
Thankfully, that’s finally changed.
As first reported by 9to5Mac, Sonos has finally rolled out an update to the Sonos app so that Trueplay is supported on the iPhone 14 (and iPhone 14 Pro). In order to take advantage of Trueplay, iPhone 14 owners simply have to update their Sonos app.
You should be prompted to update it once you’ve opened the app, but if not you can select System > and then scroll down to System Updates.

Once the Sonos app has been updated, you’ll be able to use Trueplay to tune your Sonos speakers just like before. Just open the Sonos app > select System > select the Sonos speaker you want to tune > and select Trueplay.