One UI 9 Update Disrupts Wi‑Fi, Mobile Data and SIM Detection on Multiple Galaxy Phones

Overview

• After installing the stable One UI 9 update, many Galaxy owners report random Wi‑Fi drops, devices that ignore 5GHz networks, mobile data that only works when on Wi‑Fi, and phones failing to detect physical SIM cards.
• The problem spans flagship and midrange models including Galaxy S24 Plus, Z Fold 7, A56, A36 and A52s, showing the fault is not limited to one hardware tier.
• Affected users say standard fixes do not work; attempts such as network resets, removing and reinserting SIMs, safe mode and full factory resets reportedly leave issues unchanged.
• Temporary measures like toggling airplane mode or disabling Wi‑Fi 7 in developer options can restore service briefly but the connection failures return during normal use.
• There is no official Samsung patch yet, so users should report problems through Samsung’s feedback channels, watch for system updates and expect a vendor software fix for a permanent resolution.