Install Google Translate was really a good tip. And Maybe some paper strips with translated sentences printed on it could also be helpful.

And don't forget to download a map app, not only it can prevent taxi scam to a degree, also it can help you ... well, navigate. I could recommend AutoNavi[0], but I'm not sure about whether or not it had English version.

[0] https://play.google.com/store/apps/details?id=com.autonavi.m...