How much data is used by the app?

iPlum mobile app is engineered for low bandwidth usage. It adapts to available data rates and latency of a broad range of Wi-Fi or cellular data channels, by controlling refresh rates and through efficient codec design. Calls are transferred seamlessly between Wi-Fi and wireless data channels as the user moves in and out of coverage zones.

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If data is an issue you can setup Call Forwarding in the app & receive calls on any native mobile or landline number.  You will not use data when receiving iPlum calls.  It will be used only when you call-out using iPlum.