Someone I know mentioned this little gadget thing for phones and tablets. It is a little clip that gives you a wide angle, fish eye and macro else's (plus a clip and a pouch) for about £7. They photos show macro, wide and fish. It is lightweight and small. I tried it on my iPhone 5S, iPad Mini and iPad Air. As long as the camera on your device isn't too far from the edge it should work.
Yarrashop® Universal 3 in 1 Mobile Phone Camera Lens: Amazon.co.uk: Electronics
Yarrashop® Universal 3 in 1 Mobile Phone Camera Lens: Amazon.co.uk: Electronics