Remove your back cover, battery, sim and memory card. Remove the four screws you can see.
Turn the phone over and remove the two circled stickers to reveal two more screws. Remove these screws.
Lift the back cover away at the bottom, then push in the direction shown by the arrow and the back cover will release. Be careful as the back cover is still attached by some wires (see the next photo).
Lift the back cover to one side and you'll see a connector. This attaches like a plug and socket. Simply lift it up to unplug.
The back cover is now removed. The ringer, circled, is lightly stuck down with double sided tape. Carefully lift this up. Remove the two side buttons, indicated by the arrows, and lift the buttons underneath out of their slots.
The photo below shows the ringer and buttons detached. The green circuit board should now be loose. Lift it away from the rest of the phone.
The circuit board will still be attached by a ribbon. The connector has a black hinge which you need to flick over to release the ribbon.
Your phone should now look like below. The next layer of the phone should now be loose and can be removed.
Remove the two circled stickers, at the top of the phone, to reveal two more screws. Remove these and the other two screws.
Lift the screen away from the phone. The screen is stuck down lightly with double sided tape.