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2.3.3 Installing 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.
2.3.4 Removing the RUIM card
Remove the battery after switching off your phone.
Remove the RUIM card.
Install the battery.
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