3flab is a japanese company for design. They have a website with a blog and different tooling. For the wireframe service they have two different kinds of templates. An iPhone and an iPad sketching template. It consists out of a few templates with 8, 4, 2 and 1 iPad or iPhone sketches on an A4 paper. They call it idea-sheets.
the templates are downloadable from their site.
is that all?
Yup! that’s all folks. Not much but just enough to do the trick.