One UI 9 update causes Wi-Fi and SIM card issues on Samsung devices

Samsung smartphone users are reporting widespread connectivity issues following the installation of the final version of One UI 9. The update appears to trigger spontaneous Wi-Fi disconnections, loss of mobile data, and, in some cases, the complete inability of the device to detect SIM cards.

• Key issues: Unstable Wi-Fi connectivity, cellular data failures, and SIM card recognition errors.
• Affected models: Includes Galaxy Z Fold 7, S24 Plus, A36, and others.
• Current status: Standard troubleshooting steps, such as rebooting or resetting network settings, are proving ineffective for many users.

Technical scope of the issue

The most common complaint involves erratic Wi-Fi behavior. Devices successfully connect to wireless networks but drop the connection after a short period, showing an error message. Some users are reporting specific issues with 5 GHz frequency bands or problems with the Wi-Fi 7 implementation. For flagship devices like the Galaxy Z Fold 7, reports include failures with carrier-specific features like Wi-Fi calling.

Cellular connectivity has also been severely impacted. Some devices are no longer detecting SIM cards after the update, rendering them unable to connect to mobile networks. Attempting to reseat the SIM cards or perform a full factory reset has failed to resolve the issue for a significant portion of users, suggesting a deep-seated software bug within the One UI 9 kernel or modem drivers.

Troubleshooting and official stance

Samsung moderators are currently recommending users try booting into safe mode or performing a full factory reset. However, there are multiple reports stating that these measures do not fix the problem. Samsung has yet to provide an official explanation or a timeline for a software patch.

Impact and future outlook

For users and businesses relying on Samsung devices for daily operations, this update represents a significant risk. The inability to maintain a stable internet connection or cellular signal effectively cripples the device's core functionality. It is highly recommended that users postpone the installation of this specific One UI 9 update until Samsung releases a hotfix to address these critical bugs.