Google Nexus One User Manual page 20

Your phone and accessories
To remove or insert a microSD card
You must open the phone's back cover and remove the battery to remove or insert the
microSD card.
S Remove the microSD card by pressing it toward the bottom of the phone. When
you release the card it starts to pop out of its slot, so you can pull it the rest of the
way out.
S Insert the microSD card by aligning it and then sliding it into its slot.
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Nexus One User's Guide