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This is the way how to hard reset the Google Nexus S 4G also known as Samsung SPH-D720. This will restore the phone data to original factory default settings.

We recommend to have a back up copy of all your personal data first, before proceeding. The result of this procedure will delete all data from the Google Nexus S 4G.

This procedures are only advisable if the phone experience several error problem like frozen or unresponsive.

Factory reset through menu settings:

   1. On the main home screen, select menu
   2. Tap Settings, then Privacy
   3. Select Factory data reset
   4. Select Reset phone
   5. Enter the password if prompted, then confirm by tapping  Erase everything

Google Nexus S 4G Hard Reset through Button keys combination: 

   1. Turn the power off. Take  the battery out from the phone and reinsert it back again
   2. Hold the Volume Down button
   3. Press and release the Power button
   4. You are now presented with a menu that allows for Fastbook, Recovery, Clear Storage, and Simlock
   5. Select Clear Storage by pressing the Volume Down button
   6. Press and release the Power button
   7. Confirm by selecting: Volume Up for YES and Volume Down for NO

Once the wipe is complete, the phone will reboot to its factory fresh state.