You can restart the application by following these instructions:
For Android Users
You can restart Talkatone by following these simple steps.
Launch the recent applications menu from your device.
Next, tap Talkatone and hold on the application and swipe it to the right.
For iOS users:
Double-click the home button, then SWIPE UP on the mini-window of Talkatone.
To restart Talkatone tap on the Talkatone Icon on your device.