When your SudoApp is connected to Wi-Fi, you will not incur any roaming charges.
If you are not connected to Wi-Fi while using SudoApp, SudoApp will continue to use your data according to the plan you have set-up with your phone service provider.
The voice calls are made over your data connection and consume 6 kilobytes per second. Another way to look at it is 1MB for a 3-minute call. Therefore, if you are using your device on a cellular network, the call will consume some of the data allowance from your cellular data plan. We strongly recommend that you are connected to wi-fi if using Sudo for frequent calling so that you do not incur excess charges on your cellular data plan.