Wi-Fi trouble on a Galaxy A25 is nearly always a settings or router problem, not a faulty radio. Samsung phones have two features that surprise people: Switch to mobile data, which drops Wi-Fi in favor of mobile data when the Wi-Fi is weak, and a power-saving setting that turns Wi-Fi off in sleep. Check both. Then forget the network and join it again, which clears a stale saved password or a wrong IP lease. Restart the router and the phone, since a router that has been on for weeks is a common cause of one device failing.
The phone supports 2.4 and 5 GHz, and a router that merges the bands can cause a phone to hang on one, so try each band by name. A reset of network settings clears everything wireless without touching your data. If the phone connects to Wi-Fi but pages load slowly, the issue is often the router's DNS or the channel it uses, so try the phone on a different network, such as a hotspot, to see whether the fault follows the phone. The phone's Wi-Fi diagnostics under Device care also report weak signal and congested channels.
Differential
Likely causes of “Samsung Galaxy A25 5G will not connect to Wi-Fi or keeps disconnecting”, and how to tell them apart
- 1
Switch to mobile data
What separates it The phone leaves Wi-Fi when the signal is weak
How to confirm Settings, Connections, Wi-Fi, Advanced: turn off Switch to mobile data
- 2
A stale saved network
What separates it It says connected but nothing loads
How to confirm Forget the network and rejoin it
- 3
A router that needs a restart
What separates it Other devices also struggle
How to confirm Restart the router
- 4
A band problem
What separates it It drops on one band
How to confirm Join the 2.4 GHz or 5 GHz network by name
- 5
A software glitch
What separates it Wi-Fi turns off by itself
How to confirm Update and reset network settings
Before you touch a setting
Record this first — changing settings destroys the evidence
- Whether other devices work on the same Wi-Fi
- The band and signal at the phone's position
- Whether Switch to mobile data is on
- The software version
Try in this order
0 of 9 completedToggle Wi-Fi and Airplane mode
ReversibleTurn Airplane mode on and off to restart the radios.
Forget and rejoin the network
ReversibleSettings, Connections, Wi-Fi, tap the network, Forget, and enter the password again.
Turn off Switch to mobile data
ReversibleIn Wi-Fi, Advanced settings, so the phone does not leave Wi-Fi.
Restart the router
ReversibleUnplug for thirty seconds.
Try the other band
ReversibleJoin the 2.4 GHz or 5 GHz network by name.
Reset network settings
ReversibleSettings, General management, Reset, Reset network settings.
Test the phone on another network
ReversibleJoin a friend's Wi-Fi or a hotspot; if the phone works there, the fault is your router, not the phone.
Check the router's channel
ReversibleOn a crowded apartment block, setting the 2.4 GHz channel to 1, 6 or 11 and the 5 GHz channel to a quiet one often removes drops.
Turn off Wi-Fi power saving
ReversibleIn Wi-Fi Advanced settings, switch off any option that lets Wi-Fi sleep when the screen is off.
Model-specific
What is true of this model and not of its siblings
- A router that merges bands
- One name for both bands can leave the phone on the weaker one.
- Power saving
- Battery saving settings can turn Wi-Fi off during sleep.
- Phone or router
- If other phones fail on the same Wi-Fi, the router is the cause.
- Hotspot test
- Sharing a hotspot from another phone is a quick way to tell whether the A25's radio works.
- Router firmware
- A router that has not been updated in years can have bugs with newer phones.
Stop boundary
When this stops being a self-service repair
- !If Wi-Fi fails on every network after a network reset, contact Samsung
- !If only this router fails, ask its maker
- !A phone that never shows Wi-Fi networks needs a repair
Evidence ledger
Sources behind this answer
Specifications: 5,000 mAh battery, 25 W charging, Exynos 1280, 6.5-inch 120 Hz Super AMOLED.
Owner thread linking battery drain with the 4G/5G switching.
General Samsung heat fixes for charging, apps and the case.
Exact questions
Common questions
Why does my Galaxy A25 keep disconnecting from Wi-Fi?+
Switch to mobile data, a router fault or a stale network.
Will resetting network settings delete my data?+
No, it clears Wi-Fi and Bluetooth settings only.
Does the A25 support 5 GHz?+
Yes, it supports 2.4 and 5 GHz.
Should I forget the network?+
Yes, it clears a stale connection.
Why does Wi-Fi work for others but not my A25?+
A stale saved network or a setting such as Switch to mobile data.
Does a VPN affect Wi-Fi speed?+
Yes, a VPN or a private DNS setting can slow pages, so test with it off.