This is correct for mobile devices. The meeting function is still available on the TeamViewer app. However, if you would like to join a meeting from a mobile device, we recommend that you download Blizz.
The free version of Blizz allows you to have up to 5 participants. The softwares are not compatible, so if you want to join a meeting using Blizz, the Organizer should also have Blizz. Also with Blizz you have the advantage of being able to join using just the Blizz Web Client. You (as a participant) don't need an installation on any device, simply join from Chrome or Firefox.