AT&T Results Presentation Deck

8 4Q23 Mobility Results EBITDA Margin +3 Revenues EBITDA 13 $ amounts in billions Mobility $21.5 $7.9 36.9% 4Q22 884 $22.4 656 $8.4 37.4% Postpaid Phones 4Q23 526 0.85% 0.84% 0.84% 4Q21 4Q22 4Q23 Net additions (in thousands) Churn Strong revenue and EBITDA*3 growth from high-quality subscriber and ARPU gains Wireless service revenues grew ~$600M, up 3.9% Postpaid phone ARPU of $56.23, up 1.4% EBITDA¹3 of $8.4B, up 5.6% ● ● ● ● Consistent and disciplined execution with profitable customer growth • 526,000 postpaid phone net additions; added more than 1.7M postpaid phones in 2023 Continued low postpaid phone churn of 0.84%, as value proposition continues to resonate Focus on high value customers and deliberate segmentation ● Continued strong EBITDA*3 and margin expansion from sustainable go-to-market strategy and cost transformation ● Ⓒ2024 AT&T Intellectual Property. AT&T and globe logo are registered trademarks and service marks of AT&T Intellectual Property and/or AT&T affiliated companies. t See notes slide 12 AT&T

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