We estimate 6.7 million handsets were shipped in the UK in Q4 2023, growing by 8% YoY. Apple maintained its position as the number one handset vendor across all four major UK operators during the quarter, largely boosted by the strong demand of the iPhone 14 / 15 series. Samsung trailed Apple across four major UK operators during the quarter. While Xiaomi defended number three position in the UK market, Oppo continued to lose momentum. This report tracks quarterly handset vendor market share at the four major UK operators -- EE, Vodafone, O2 and Three -- from Q1 2009 to Q4 2023.