The first year is $0 when you buy a new iPhone, so pro-rating wouldn't make a difference.
I often sign up for trials and immediately cancel (so I don't forget about them). That way it requires a positive action on my part to keep the subscription. That doesn't work if your access ends as soon as you cancel.
I often sign up for trials and immediately cancel (so I don't forget about them). That way it requires a positive action on my part to keep the subscription. That doesn't work if your access ends as soon as you cancel.