Earlier this year, the Snapdragon 835 powered a mobile router that clocked 930Mbps download speed. The Sony Xperia XZ Premium is based on the same chipset and it reached 750Mbps in "real-world test conditions" - specifically EE's LTE network at Wembley Stadium in London. The test put the one of a kind screen to good use by streaming The Grand Tour in 4K HDR (from Amazon Prime). Other things that the Sony team tried out was to download high quality music for offline listening and downloading "humongous" files from Google Drive. They don't specify how they tested the upload, but the...
Source: http://www.gsmarena.com/sony_xperia_xz_750mbps_download_speed-news-26871.php