How to Fix Galaxy S25 Mobile Data Not Working After Update
If mobile data stopped working on your Galaxy S25 after an update, the problem is usually tied to network settings, APN changes, SIM reprovisioning, or a temporary modem bug. This can show up as no internet on LTE or 5G even when signal bars still look normal.
The steps below are aimed at restoring cellular data on the Galaxy S25 family as quickly as possible.
Fix #1: Turn Mobile Data off and back on
Go to Settings > Connections > Data usage and toggle Mobile Data off for a few seconds, then back on. This refreshes the data session without changing anything else.
Fix #2: Restart the phone
A normal reboot reloads the modem and carrier settings, which is often enough after an update.
Fix #3: Toggle Airplane Mode for 30 seconds
Enable Airplane Mode, wait half a minute, then turn it off. This forces the phone to reconnect to your carrier and request a fresh data session.
Fix #4: Check your preferred network mode
Go to Settings > Connections > Mobile networks and make sure 5G/LTE/3G/2G auto connect or your carrier-recommended mode is selected. An update can occasionally switch the radio mode.
Fix #5: Verify the APN settings
Open Access Point Names and compare the active APN to the one listed by your carrier. If the APN changed or looks blank after the update, re-enter the correct values.
Fix #6: Reseat the SIM or refresh eSIM
If you use a physical SIM, power off the phone and reseat it. If you use eSIM, check that the line is still active and enabled under SIM manager.
Fix #7: Reset network settings
Go to Settings > General management > Reset > Reset mobile network settings or Reset network settings. This clears broken cellular, Wi-Fi, and Bluetooth settings that may have carried over badly after the update.
Fix #8: Install any carrier settings or firmware patch
Check for system updates and contact your carrier if they can reprovision the line. Some post-update data failures are fixed on the carrier side.
Fix #9: Test another location and another SIM if possible
If data still fails, rule out a local tower issue or SIM fault before assuming the phone hardware is bad.
When to get more help
If the problem started immediately after the update and none of the software steps worked, back up your data and contact the device maker or carrier for deeper diagnostics. If one exact symptom keeps returning, it is often a sign that the update exposed a hardware weakness rather than creating the entire problem by itself.