Nokia Lumia 925 User Manual page 7

Tip: Use the SIM door key to unlock the SIM holder. If you lose the key, you can use a paperclip.
The phone must be switched off before inserting the SIM card.
1. Push the key into the hole until the holder is released, and pull the holder open.
2. Make sure the contact area is facing up, and put the card in the holder.
3. Push the holder back into your phone until it locks into place.
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