There are many countries where cellular and WiFi links are roughly competitive. And not surprisingly, WiFi has a clear advantage countries where home broadband is relatively fast, such as Hong Kong, Singapore, South Korea and the US. However, LTE provides a consistent edge for download speeds in some areas -- in Lebanon, your downstream speeds tend to be 25Mbps faster than on WiFi.

The findings led OpenSignal to suggest that users and device makers alike need to rethink the assumption that WiFi is usually best. While that might have been true when smartphones were young, it's not so true any more in the LTE era -- and WiFi has its own problems, such as overcrowded networks. This is before 5G promises gigabit-class speeds for some users, too. While WiFi has its purposes (both for local networking and for places with data caps), you might find yourself sticking to cellular access more often going forward.