If someone were to ask you what the best selling Android smartphone worldwide was in the first quarter of this year (January to March), what would you say? Probably something starting with "Samsung". But you'd be wrong. The world's best selling Android phone in that period was none other than... Oppo's R9s. That's quite shocking, but the explanation for it beating all of Samsung's models probably has something to do with the Note7 debacle. Had that device been on sale in Q1 2017, it probably would have bested the R9s. It's also important to note that Oppo is only selling the R9s...
Source: http://www.gsmarena.com/oppo_r9s_was_the_worlds_third_best_selling_smartphone_in_q1_behind_only_the_iphone_7_and_iphone_7_pl-news-24963.php