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Also, my customers are on mobile primarily, so I need icons to work on mobile.
You can inject a custom CSS codes to your form to do that. For the Credit Card Number input:
Change http://www.jotform.com/icon/cc.png to your actual credit card icon.
The same codes for the CVV input:
Still, change the URL of the icon.
Here's a guide on how to inject a custom CSS to the form: http://www.jotform.com/help/117-How-to-Inject-Custom-CSS-Codes
Thanks Welvin. This put me on the right track to get what I wanted!
I just had to add background-position: 7px 7px to position the icon where I wanted.