A hardware defect in a limited batch of iPhone 18 Pro Max phones is causing loss of cellular service for AT&T customers, prompting Apple to offer replacements and an iOS 27.0.1 carrier update.
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AT&T warned iPhone 18 Pro Max owners that calls, texts or data may fail and recommended an immediate iOS 27.0.1 update, though many say the fix hasn’t helped.
AT&T says it won’t adopt iPhone Handoff, while T‑Mobile and Verizon plan to support the new iOS 27 feature.