Cullian App has been purposefully designed to only use a fraction of the data compared to other mobile voice apps, meaning that you only pay a fraction of the cost, especially when roaming or calling abroad.Cullian App uses advanced technology to ensure high quality voice calls over data connections allowing over 30 minutes of talking per Megabyte. Compare us to other mobile VoIP solutions that use a Megabyte per minute or more.Very competitive international call ratesVoice calling, photo messages and location-sharing with Cullian users*Simple and quick registration using your mobileInstantly integrates with your own contact listLow data usage on 2G, 3G, 4G or Wi-FiCalls use your data plan