this is a really simple lens you can put together to get nice macro shots for any mobile or tablet camera. i have seen this a few times before but i have seen ways that could damage the device or just take to much time.
Step 1: Materials and Tools
the materials you will need are:
clothes line peg (plastic)
engraver/drill with small drill bit (size of lens)
any circular cutting tool
For this I used an old engraver I had in my room