Best answer by Dennis
You can only have one tab per line. If you want a second phone on the tab you would need to either add a second line to your account or pay off your remaining tab and start a new one for the new phone.
In addition, this will help determine which tab your plan would qualify for
https://www.koodomobile.com/help/keeping-or-changing-your-plan-when-you-upgrade-your-phone View original