Contact Koodo Mobile as they will be the one to tell you how much the security deposit is.
Security deposit is the amount of collateral a customer deposits to the service provider. It is usually required when you have bad credit and you want to get a free phone and/or a postpaid plan. In case you don't pay up on time, the deal maybe off and the service provider gets the security deposit for good. But if you pay on time, after a year or so, the security deposit amount will be given back to you as credit in your account.