Carefully insert a plastic opening tool between the rear panel and the inner rear frame near the rear-facing camera.
Pry up the rear case around the edges of the Nexus S using your plastic opening tool.
Lift the battery from the end closest to the headphone jack using the edge of a plastic opening tool.
Now the battery can be removed from the Nexus S.
Slide the SIM card downwards from the SIM card slot using your thumb.
Remove the SIM card.
Six Phillips screws securing the rear inner frame to the inner case need to be removed.
Carefully insert the flat edge of a plastic opening tool in between the rear inner frame and the top left corner of the Nexus S.
Pry the opening tool upwards to pop the top right corner from the clips securing it to the inner assembly.
Insert the plastic opening tool to the right of the power button.
In order to release the clips on the right side, you need to slide the plastic opening tool downwards along the edges of the Nexus S.
Release the bottom clips located near the bottom of the Nexus S in the same way as previously described.