To remove the battery cover, lift from the Battery Compartment Release slot on the bottom middle of the phone.
To remove the battery, lift from the slot at the bottom of the battery.
Insert the SIM card into the slot, ensuring the gold contacts are facing the device.
To reinsert the battery, place the top of the battery in the battery compartment, ensuring the gold contacts align with the battery terminals on the device.
Press the battery into place.
Reattach the battery cover and press the cover into place.