How Do I Activate My Citibank Government Travel Card?

How Do I Activate My Citibank Government Travel Card? If you have a government travel charge card, please make sure your new CitiBank card is activated. Go to http://cardactivation.citi.com or call CITI at 877-905-1861. What number do I call to activate my Citibank card? By phone: Call 1-877-905-1861 and enter your credit card account number,