Changing/Upgrading Phone? | Koodo Mobile | Forum

i was wondering is there anyway that you can upgrade to a new phone, because i have the Motorola W385(the phone hasn't worked properly since i got it) with koodo but, i’d love to get the LG KEYBO, also on the koodomobile website it says “change/upgrade phone” so i was wonder how what exactly you do to do that. help please?