What minimum mobile data connection do I need to use the Myfone app?

4G is recommended as a minimum.

It is not a requirement that you have 4G coverage on your phone to use the Myfone app. However, you should be aware that the phone must have access to either EDGE, GPRS or Wi-Fi to fetch data. The app's call functions cannot be used over EDGE, as EDGE does not allow calls and data usage at the same time. We do recommend that you have at least 4G on your smartphone for the best user experience.