How do I open a PDF file on my phone?
In the Books app , you can open and save PDFs that you receive in Mail, Messages, and other apps.
Why can't I open PDF on my iPhone?
If you are having this problem with some PDF documents, it is possible that those PDF documents may be corrupted. These files cannot be opened if they are corrupted. Perhaps the PDF file you could not open was not downloaded properly. You may want to obtain (re-download etc) the file again.Nov 22, 2019