Yes, voice chat on Roblox does work on mobile devices. However, it is only available on the Roblox mobile app, which can be downloaded for free from the App Store or Google Play.
To use voice chat on the mobile app, you will need to join a multiplayer game, tap on the chat icon, press and hold the microphone icon, and speak into your device’s microphone.
Release the microphone icon to send your message.
It’s important to note that you will need to have your device’s microphone enabled for voice chat to work on the Roblox mobile app. Also, be sure to follow the terms of service and community guidelines while using voice chat on Roblox.