When Microsoft has already updated Cortana to version 22.214.171.124, for the andoid platform Cortana is still going through beta testing sessions. Android users can replace Google Now making Cortana their default personal assistant. If you want Cortana to appear in your android phone instead of Google Now then change the settings in the “home” button.
It is very uncertain that when the final version of Cortana will be be moved out of beta testing for a release so that it can be downloaded from Google Store with a tap to the screen so it is better to be interested for the beta version.
Most the features of Cortana which the Windows phone users can enjoy now will be available for the Android users after the beta test session finishes till then android users can only scream “Hi Cortana” without any response from it!
Download latest version of Cortana from ApkMirror.