There are three properties for a tag that refer to the hyperlink. I hope to translate them well into English: "Is hyperlink", "Display as hyperlink" and "Objective of the hyperlink". Keep the first in Yes. The second in Always. And the third blank, which is the one that I have doubts about whether I have to write something. But if I leave the latter blank, in the pdf, when viewing it on the mobile and clicking on it, it does nothing. I think I have to add something to the objective of the hyperlink, but I would like it to be dynamic, to take a phone number that the user has previously entered in a data form, and if I update it tomorrow, I don't have I have to update the hyperlink.