@TeresaLisboa has a good point - don't do it now - too many issues with the game - BUT - in the past, I have transferred my android games from one device to another by using the same google play account, downloading AC, and google play will transfer the game. Be sure you don't play it on the old device again though, as that is against terms of service.Do you have any issue in using another new mobile to play Airport city? In the past, it is workable, but now it seems to be a problem. May you share your experiment, thanks.