AT&T Results Presentation Deck

1Q21 Progress Toward Growing Customer Relationships Postpaid Phone Subscribers Net Adds thousands millions 63.1 62.9 63.5 0.86% Wireless 1Q20 2Q20 3Q20 4Q20 Postpaid phone subscribers Postpaid phone churn ● ● 64.2 4 64.8 Efficient and Effective 0.76% 1Q21 163 595 1Q20 1Q21 Mobility EBITDA grew 2.3% EBITDA service margins expanded 100bps April 22, 2021/ © 2021 AT&T Intellectual Property - AT&T Proprietary millions ● ● AT&T Fiber Subscribers 4.1 30% 4.3 Fiber 4.7 5.0 Fiber subscribers Penetration 5.2 35% Net Adds thousands 1Q20 2Q20 3Q20 4Q20 1Q21 1Q20 1Q21 209 IP Broadband revenues up ~5% IP Broadband revenue growth offsetting legacy declines + See notes slide 11 235 ● ● HBO Max and HBO Subscribers millions 33.1 HBO Max 1Q20 36.3 38.0 41.5 44.2 2Q20 3Q20 4Q20 1Q21 Domestic HBO Max and HBO subscribers +4 DTC subscription revenues up ~35% Transformation savings helping offset HBO Max investment AT&T

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