Nokia Lumia 520

Remove the back cover

Turn the back of your phone towards you.
Take hold of the top of the back cover and remove it.

Insert your SIM

Place your SIM as illustrated next to the SIM holder.

Insert your SIM

Slide you SIM into the holder.

Insert the battery

Place the battery in your phone, top first, matching the battery contacts with the phone contacts and press the battery into place.

Replace the back cover

Place the back cover on your phone and press it into place.