Other than Google Play, do all the other functions on the ST-16 work?
Mine has google play on it as well but it does not function, I get a Google services NOT INSTALLED message.
I do not think the android in ST-16 was written to use it as a full blown tablet, although I know some users have installed and use playstore on theirs. Personally, I do not recommend installing APKs not written expressly for the ST-16. Do you really want to risk one popping up and hijacking your Wifi while you are in flight?