Hi I just got an iphone 4 so i ordered a new sim that would fit. I recieved my sim card today but it says my activation code isnt working?
If you want to swap to another SIM then I'm not sure that you activate it like this.
I think you need to contact 48 support and ask them to switch your account/number/membership over to the replacement SIM. That's what a friend of mine did recently when swapping from one SIM (lost/stolen) to another.
Hope this helps.