haier D1200P - Manual (Page 18)

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2.3.3 Installing the RUIM card
2.3.4 Removing the RUIM card
Purchase a RUIM card from network operator. Your phone number and
registration information are stored in your RUIM card. Your RUIM card can be
used in any a CDMA phone. Your number and information will not change.
Make sure to switch off your phone before taking out the battery.
Make the metal face of the RUIM card down and put it conferring the level of
the card. Then install the battery.
Remove the battery after switching off your phone.
Remove the RUIM card.
Install the battery.