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WebMar 2, 2023 · For new AT&T internet service, first-time customers can call AT&T’s toll-free customer service number at +1-866-861-6075 (Monday–Friday, 8 a.m.–7 p.m. and Saturday–Sunday, 8 a.m.–5 p.m. ET). Or if you’d rather sign up online, you can get home internet, wireless, or business service set up 24/7. Contact AT&T customer service
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