You can use this app in offline! Case 1). I have get on a taxi from Taiwan. Talk confidently in English. "One Hundred one tower, please". However, the taxi driver says, "Huh? ". That's right. In Taiwan people use only Cantonese. They can not understand English. Case 2). 22: 00, After walking arround 101 Tower, I'm waiting for a taxi from the taxi line was boarded 30 minutes.