It is under the sim/sd door. Lift up the black paper flap that has your phone serial number and IMEI. The water damage indicator should be in a small hole on the phone body above the info sticker.
Sent from my C6506 using xda app-developers app
---------- Post added at 11:55 AM ---------- Previous post was at 11:48 AM ----------
Sorry can't edit on mobile.
Be careful not to tear the info sticker. It is two layers that folds out. You should remove your sim and sd since the ends of both cards hold the top of the paper down.
Sent from my C6506 using xda app-developers app