Step 1: Get ready
If you don't have any sugru, you can buy it from www.sugru.com
Step 2: Open sugru
Step 3: 4 corners = 4 pieces of sugru
Press a piece of sugru onto each corner (be careful not to cover the buttons, speakers or camera lens) - then fold the sugru over onto the glass on the front and back of the phone.
Step 4: Get the shape right for you
Step 5: Leave sugru cure
Step 6: OK - but does sugru come off?
Step 7: Wipe it clean
Step 8: Good to know:
sugru does bond to previous iPhone screens!