Did you put in Panorama mode, start taking a picture (push button), then move the phone consistently to the left/right or up/down?
Don't push the button for the next photos, I think it dings every time it adds another photo. It will only do 4-5 together. Move the phone smoothly and slowly.
I tried it a while to get it down. A default landscape mode panorama generates only a 5000x500 image. I tried holding it portrait to do a landscape panorama, but you don't get a huge image, just a wider field of view than normal.