i already have a plan on koodo and a phone, but i want a new phone, so lets say if i buy an iphone 4 at lets say wallmart, can i put that phone onto my plan with koodo or do i need to buy the phone from koodo to put it on my plan ?
As long as the phone you buy from lets say Walmart is unlocked then yes you can bring it to Koodo & get it setup as your new phone. If it isn't unlocked then you have to pay to get it unlocked. Ask before you buy if it is unlocked.
How much to unlock depends who it us locked too, if Bell then drop the phone & run from the store as fast as you can.
If you buy it from a carrier (Bell, Rogers, Koodo etc...) it will be locked even if you pay full price up front, at least until Dec 2nd 2013.