Thank you for your reply.
I tested with below conbinations.
iPhone and Chrome, the result is PDF is not opened.
iPhone and Safari, the PDF shows Preview screen.
Android and firefox, the PDF is downloaded.
I would like to get the infromation about the behaivour of PDF on smart phone with various combinations such as OS and Brower, and then each version of OS and Browser.
I am very sorry but I cannot speak English well.
I am not sure whether I can tell what I would like to know.
If somebody can answer in Japanese, it is also very helpful me.
Of cource I will try to understand if it is written in English.