I just upgraded from 520 to 535. I bought the 520 in 2013 when it was released and it really served fine. It made me love Windows Phone even more. I like to stick with the 5** brands cos of price range. Though my 520 runs windows 10 too it just needs to catch up to trend that's why I decide to upgrade to a 535..... I really hope the upgrade is worth it.
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