What is iSaw® and how does it work? iSaw® is a groundbreaking method of utilising the gyroscope feature of your iPhone to enable you perform pin-point accurate jigsaw cuts on any material, in any situation. iSaw® gives the novice the ability to create a craftsman's finish time and after time. Read more: http://www.toolstop.co.uk/isaw-is-set-to-revolutionise-your-jigsaw-experience-a1381#ixzz2xg2mRuT2
Not sure all the vibration will do your phone a lot of good. Got to say things like this is why we live in a world of no craftmans anymore, what's wrong with a pencil and some skill.