Zte Obsidian - Handling, Environment, and Special Warnings; Product Handling and Care Instructions; Environment-Specific Safety Precautions

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2. Remove the battery.
3. Hold the micro-SIM card with the cut corner oriented as shown and push it into the card slot.
CAUTION: To avoid damage to the phone, please do not use other kinds of SIM cards, and do
not use a non-standard micro-SIM card. You can get the standard micro-SIM card from your
service provider.