Move or Remove Callouts on the left or right sidebar in magento

Edit your theme's "/layout/catalog.xml" file. Fine the below lines.

    

        images/media/col_left_callout.jpg

        Our customer service is available 24/7. Call us at (555) 555-0123.

        checkout/cart

    

If you want to remove callout from left sidebar just comment those lines. Suppose you want to show that callout in your right sidebar just change reference name="left" to reference name="right". Likewise you can do it for right sidebar callout.
Remove Your cache and check. Thats it you are done.