What activation code are you referring to?
If it's the number porting security code by text message to your old provider's SIM/number then see here:
Keep your current SIM Inserted in your handset as we need to send a security code via SMS to start your number transfer.
If your current SIM isn’t active and your unable to receive SMS to the number you want to keep, you’ll need to contact your old provider regarding your account. Your current number and SIM need to be active to move to 48.
If you're referring to something else then you'll need to explain more clearly and in more detail what you're referring to.
If you need to contact 48 support about this then see the links in my signature below.
