A co worker told me I can add on that service.
The answer varies depending on which phone you have. In all cases you will be able to call and text to the U.S. and Canada when connected to WiFi.
All republic phones work on WiFi to call back to US and Canadian numbers, one can add a WiFi ”local” numbers calling with a US based international calling card or a third-party app
The 3.0 phones also have the option to swap the SIM with a local provider for local calling [though while the Republic SIM is not installed you lose the WiFi calling back to the US and Canadian numbers]