The top-spec phone in the Xiaomi 13 Series is on sale now, but unlike the regular 13, 13 Pro and 13 Lite, it isn't available in the UK.
Xiaomi 13 Ultra global launch date officially confirmed, purchase benefits revealed - Gizmochina
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Xiaomi 13 Pro / Xiaomi 13 global version appears on Geekbench
Xiaomi 13 Global Release Date, Price and Specs - Tech Advisor
World Premiere] Global Version Xiaomi 13T Pro 5G 50MP Leica Camera 144Hz AMOLED Display 5000mAh Battery 120W HyperCharge IP68 - AliExpress
Xiaomi 13 Global Release Date, Price and Specs - Tech Advisor
Samsung Galaxy S22 Ultra 128GB (Unlocked) Phantom Black SM-S908UZKAXAA - Best Buy
Xiaomi 13 review: Fantastic Flagship - Tech Advisor