How do I activate a gift card using the CardNow Mobile App? Follow CardNow Support August 13, 2020 14:57 Updated Watch our How To video to learn how to use the CardNow mobile app to activate gift cards from a CardNow Starter Kit. Related articles How do I use the CardNow app to load a gift card? How do I use the CardNow mobile app? I'm low on gift cards in my CardNow box. How do I get more? How big is the CardNow Starter Box? (Will it fit in my kitchen or desk drawer?) Do I have to use the app in order to use CardNow? Comments 0 comments Article is closed for comments.