You can backup some information (contacts and text messages) to your SIM card. Depending on your SIM card, you may be able to backup 500-2500 contacts. The number of text messages you'll be able to store also depends on your SIM card.
K610i
To back up your contacts:
From standby, select "Menu" > Contacts > More.
Select Options > Advanced.
Select Copy to SIM > Copy all.
Your phone will display a message telling you that your SIM contacts will be replaced by your phone contacts. Select "Yes".
To save a text message to your SIM:
From standby, select "Menu" > Messaging > Inbox.
Highlight a message, and select "More" > Save message.
Save your message in Saved messages or Templates, and press "Select".
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