I want to be clear: I really don't follow unlicensed spectrum in urban areas. But it might be the challenge that you're facing. The issue for us is that there are not a lot of rules around how that spectrum is managed. So in essence you can't control it.
Where we own spectrum, we can dedicate spectrum and say that this is for our customers; and as customers grow in their usage profile, which has happened over the last five years, we can use that spectrum confidently knowing that we have it. The challenge with the unlicensed spectrum is that you can't control the service experience.