Hey there Veronica! Just to clarify, you won't be able to use the same SIM card that your friend used. If you currently have a Koodo phone, you will be able to use the same SIM card if it's the same size. If your SIM does not fit, you can simply purchase a new one at the location nearest to you http://koo.do/kdostore . As Spence mentioned, the phone will need to be unlocked if it's not a Koodo phone. Have a good one!