One UI 9 is breaking Wi-Fi, data and SIM detection on some Galaxy phones. Here's what to try.
Since the stable One UI 9 update, Galaxy owners report dropped Wi-Fi, lost mobile data and, in some cases, phones that stop detecting their SIM.
Phones disconnect with a Connection failed error, skip the home network or refuse 5GHz Wi-Fi while 2.4GHz still works.
Owners name the Galaxy S26 Ultra, S24 series, Z Fold 7, Z Flip 7 and A-series phones like the A36, A55 and A56.
Restart or toggle Airplane mode, rejoin your network, then reset network settings. Results are mixed, and the problem can return within hours.
Samsung has not acknowledged the bug yet. Hold off on a factory reset and file a report in the Samsung Members app.
One UI 9 Broke Wi-Fi or Mobile Data on Your Galaxy? Here’s What to Try