How do i activate my card? You can do it online via the activation page, here's a direct link: sign in to access your optimum account. redeem exclusive offers and deals with optimum's services for connectivity and mobile plans. activate your reward card using the activate card tab above. You can enter the last four digits of your phone number as the activation code. You can also call customer care to. please enter your username and password. This has been supplied to you by optimum card solutions. you need to activate your card if you're a new optum card user or if you got an additional or replacement card for an existing account. There are 3 ways to activate your card:
