You can do this when you allow iPlum app to access your Microphone. In iOS, simply go to Settings > iPlum app and grant access to Microphone and Audio settings. In any case you’ll need to do this for making phone calls. In Android, go to Settings > Device > Apps and find the iPlum app, and make the changes in the Permissions section.
Thanks, your download link is on its way!
Now how about inviting your colleagues and friends to join you on iPlum? More contacts on iPlum mean more secure communication for everyone!