When a Galaxy A55, A54, A35 or A25 will not connect to Wi-Fi or keeps dropping it, Samsung's order is: restart the phone, update the software, check Wi-Fi is on, forget the network and reconnect, and test in Safe mode to find out whether a recent app is the cause. If that fails, reset Wi-Fi and Bluetooth settings under General management, then check the router: update its firmware, see whether other devices detect the network and restart it. Samsung Members diagnostics can test the phone's Wi-Fi. The A55, A54 and A35 are dual-band Wi-Fi 6, while the A25 is only Wi-Fi 5 (802.11ac), so an A25 is the one most likely to struggle on a modern router.
Differential
Likely causes of “Samsung Galaxy A-series family will not connect to Wi-Fi or keeps disconnecting”, and how to tell them apart
- 1
A temporary software error
What separates it Wi-Fi fails or drops after the phone has run for a long time or after an update
How to confirm Restart using the power menu, or hold Side and Volume down for more than 7 seconds if the menu does not appear
- 2
Wi-Fi off, wrong password or a corrupted saved network
What separates it The phone sees the network but will not join, or joins with no internet
How to confirm Turn on Wi-Fi in Settings, Connections, then press and hold the network, tap Forget network and join it again
- 3
A recently installed third-party app
What separates it Wi-Fi works normally in Safe mode but not in normal mode
How to confirm Samsung says to remove recently installed apps one at a time, in the order they were installed, and restart
- 4
The router or its firmware
What separates it Other devices also fail, or the network is not listed on any device
How to confirm Update the router firmware, check whether other devices detect the network, and restart the router by unplugging its power cable
- 5
An A25 on a network it handles poorly
What separates it The A25 connects to the 2.4 GHz name but drops or is slow on a busy network
How to confirm Wikipedia lists Wi-Fi 5 dual-band for the A25 against Wi-Fi 6 on the A55, A54 and A35; join the 5 GHz name and keep the router's firmware current
Before you touch a setting
Record this first — changing settings destroys the evidence
- Which of the four models you have and the software version
- Whether other devices and other networks work, and which band the network uses
- The router make and model, and its firmware version
- The exact message: authentication problem, no internet, or the network not listed
Try in this order
0 of 7 completedRestart the phone
ReversibleSwipe down for Quick settings, tap Power off, then Restart twice to confirm. If the phone is frozen, hold the Side and Volume down keys for more than 7 seconds until it restarts.
Update the software
ReversibleOpen Settings, Software update, Check for updates and follow the prompts. Samsung notes mobile data charges may apply if you update without Wi-Fi.
Check Wi-Fi and reconnect the network
ReversibleTurn Wi-Fi on in Settings, Connections, Wi-Fi, then press and hold the problem network, choose Forget network and join it again with the password.
Test in Safe mode
ReversibleOpen the power menu, press and hold Power off until Safe mode appears and tap it. If Wi-Fi works normally, remove recently installed apps one at a time and restart to leave Safe mode.
Check the router
ReversibleMake sure the router firmware is current, see whether other devices detect the network, and restart the router by unplugging its power. Samsung says to contact the router's maker if the network cannot be detected on other devices.
Reset Wi-Fi and Bluetooth settings
ReversibleOpen Settings, General management, Reset, Reset Wi-Fi and Bluetooth settings and confirm. Rejoin each network afterwards.
Run Samsung Members diagnostics
ReversibleOpen Samsung Members, tap Support, Get started, and run the Wi-Fi test. If it reports a fault, book a service visit.
Model-specific
What is true of this model and not of its siblings
- Wi-Fi and Bluetooth
- Wikipedia lists Wi-Fi 6 dual-band with Wi-Fi Direct and Bluetooth 5.3 on the A55, A54 and A35, and Wi-Fi 5 (802.11ac) dual-band with Bluetooth 5.3 on the A25.
- Chips
- Exynos 1480 (A55), Exynos 1380 (A54, A35) and Exynos 1280 (A25); Samsung's Wi-Fi article is the same for all four.
- Part numbers
- Note the router's brand and model rather than a part number. The phone's own model number, an SM- code, is under Settings, About phone.
- Tools and supplies
- A second device on the same network, the router's admin page, a flashlight to read the router's label and paper for passwords.
- Repair cost
- A Wi-Fi fault is rarely a paid repair. If the radio is faulty, Samsung quotes at service; a repair shop's 2026 table lists $139 for an A54 screen.
- Other models this page answers
- These steps also fit the Galaxy A54 5G.
Stop boundary
When this stops being a self-service repair
- !If the phone fails on every network after a reset and Samsung Members diagnostics, visit a Samsung service center
- !If one network fails on every device, contact the router's maker for support, as Samsung says
- !If Wi-Fi drops only within a meter of a good router in Safe mode, book a diagnostic for the radio
Evidence ledger
Sources behind this answer
Restart, update, forget the network, Safe mode, reset, router checks and diagnostics.
A55 battery, charging, chip, storage, Wi-Fi, display, glass and SIM tray.
A54 battery, charging, chip, storage, Wi-Fi, display and glass.
A35 battery, charging, chip, storage, microSD, Wi-Fi and display.
A25 battery, charging, chip, storage, microSD, Wi-Fi and display.
Exact questions
Common questions
Do the A-series support Wi-Fi 6?+
Wikipedia lists Wi-Fi 6 (802.11ax) dual-band for the A55, A54 and A35, and Wi-Fi 802.11 a/b/g/n/ac dual-band, which is Wi-Fi 5, for the A25.
Can the A-series use the 6 GHz band?+
No. All four are dual-band, so they use 2.4 and 5 GHz only.
How do I forget a Wi-Fi network on a Galaxy?+
Open Settings, Connections, Wi-Fi, press and hold the network, tap Forget network, then select it again and reconnect.
How do I reset Wi-Fi settings?+
Open Settings, General management, Reset, then Reset Wi-Fi and Bluetooth settings and tap Reset settings.
What is Safe mode for?+
Samsung says if Wi-Fi works normally in Safe mode, a recent third-party app is causing the fault; remove recent apps one at a time.
Will resetting delete my photos?+
No. Samsung's reset removes Wi-Fi and Bluetooth settings only, not photos or apps.
Can I update the software without Wi-Fi?+
Samsung says updates can be installed wirelessly or through the Smart Switch program on a PC; mobile data charges may apply if you update wirelessly without Wi-Fi.