So, I am likely to get flamed, but my searches did not avail me so I am reaching out to the WP community. I have a1520 and I love it, my contract is about to end with AT&T ( I have the glossy red at&t version) and I am debating on switching carriers to T-mobile. My worry is that as T-Mobile does not carry the 1520, when the 8.1update hits, is there any certainty that I would receive the update? Your help is appreciated!