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.
W350i
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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