I know a lot of members use their mobile devices to WikiTree. I'm not sure what you mean by downloading information. Citing doesn't require downloading. If the information is available online, a link is sufficient. If it is a book or other publication, giving the title, author, publisher, publication date, volume, and page number is all we need. If it is, as you say, an official document, the type of document (birth certificate, baptismal record, etc.) and the location where one might view or obtain a copy would work. None of that requires downloading data.