Shut down the phone.

Push SIM card until it pops out.

Remove SIM card.

In some version of this phone, a microSD memory card can be installed. If so, you must also remove these cards.

Be careful as to not damage the microSD memory card. Unlike the SIM card, pushing this in may not spring release, as there may not be an eject mechanism.

If there is no spring release eject mechanism, hopefully your microSD card has a ridge/raised edge that you can push on with your fingernail or plastic/rubber tool to push the card out. This may be difficult - be patient and do not use excessive force/sharp tools that could cause permanent damage and permanent loss of data.