I used the opening device to un clip the silver front of the phone by inserting it at the point shown in the image and then running it down the side of the phone downwards (towards the bottom).

Rinse and repeat on the other side.

Then I ran the opening device carefully round the top edges of the phone, there was a clip at the very top.

Pulled the casing apart gently.

I now have the front and back part of the Nokia E72.