Your phone supports an optional microSD card up to 256 GB.
The type to buy depends on how you'll format the card:
Portable storage (can use card in different devices): A Class 2, 4, or 6 card is sufficient.
Internal storage (card used only by phone): Use a high speed card such as UHS-1 type for best performance. Class 2, 4, or 6 cards are slower than your phone’s internal storage, so using them for internal storage would slow your phone's performance.
Learn more about the differences between portable storage and internal storage.
Turn your phone upside down, and put your fingernail in the notch on the bottom corner.
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Pry off the cover. Don’t be afraid to use a little muscle.

To remove the SIM card, slide the pin forward.
Then, pull the card out.

To insert a SIM, slide it into the SIM slot with gold contacts facing down.

To insert an SD card, slide the SD card into the slot on top of the SIM.

Snap the cover on.

Select an issue to see troubleshooting steps.