Can I port a number after activation?

The Mint app bugged out, after trying to port my number it glitched and the screen to enter my details in no longer appeared. I naively thought it had taken the number (I added in all the details and hit the option to continue), but there was no email confirmation nor any indication that it was going to port in my old number.

Can I still port over my number or will I need to refund my plan and purchase a new SIM card?