Sharp AQUOS Crystal Sprint User Manual page 17

If your phone has become warm, insert after it has cooled. May cause burns.
1. Remove the battery cover.

Lift where marked ○ (indent) and create a gap between the battery cover and the phone.
Continue by sliding your finger completely around the phone under the battery cover to
remove.
2. Insert SIM card in SIM card slot.

Insert gently being careful of SIM card orientation (notch/(gold) IC chip facing downward).
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