It's very difficult to connect an old 3D printer to a smartphone. I remembered trying to set up my wireless printer to connect to my laptop and that was hell for me. It was then that I came to the conclusion that wireless printers are just crap ... I prefer the wired models from Brother and can be found at
https://www.mrdepot.ca at great prices. A colleague of mine worked on such a printer and had no problems with these models ... So after that I prefer to use only these models.