I was just given a old Blackberry that is unlocked. I want to change my current plan to work on this phone. I have an old sim card that was previously active on this account, but is not currently being used. Can I just add my old card into this 'new to me' phone??
Oh that's tough to say because it's after 90 days it becomes inactive (the sim) and you need to buy a new one. Go on self-serve and try and make the change. If it doesn't accept it, you most likely need a new sim card.