Bolivia still has (as of one year ago) 16 fully-modernized (glass cockpit) T-33s in service… and not just as trainers, either.
No, they are the primary combat aircraft of the Bolivian Air Force.*

See this thread:
http://forum.keypublishing.co.uk/showthread.php?t=74944

*http://www.aeroflight.co.uk/waf/americas/bolivia/Bolivia-af_current_inventory.htm