The amount of available secure traffic doesn't affect the amount of internet traffic available from your mobile operator. You can continue using the internet after the secure traffic limit is exceeded, but your data won't be secured by VPN.
In the free version, the secure connection will be disabled when the secure traffic limit is exceeded. The app notifies you when your secure connection has been disabled. You can wait the time specified in the main app window and then re-establish a secure connection. The amount of secure traffic displayed as used in the app may slightly differ from the amount actually used.
In the unlimited version, your daily amount of secure traffic is not limited. Your subscription for the unlimited version may include either one or several devices. If your subscription works for several devices, connect them to one My Kaspersky account to share your subscription. On My Kaspersky, you can also disconnect the devices from your subscription.