All communications are encrypted and secure! all via SSL (regardless if you use myPhoneDesktop's Desktop, Web Client or iPhone app).
All information (data) is travel in encrypted form via myPhoneDesktop servers which are required for authentication and to determine to what specific iDevice message would need to be sent. myPhoneDesktop Services are also required to provide Apple Push Notification Service. myPhoneDesktop works either via Wi-Fi (if available) or via 3G or other cellular connections.