The easiest way is a mobile fax app. I used eFax — uploaded my PDF, typed in the fax number, and sent it. It only took a few minutes, and I got a confirmation receipt. For more detailed instructions and tips, https://orngjce223.net/ has really useful articles. They walk you through the process, show the best apps, and explain all features for sending and receiving faxes directly from Android. It made my first mobile fax totally stress-free.