Original topic:
Will Not Connect to WiFi
(Post creation time:
06-4-2026 02:17 AM
)
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U
userOQlYz1En6L
Asteroid
My S21 will no longer connect to my house wifi. I have great internet too. I have restarted phone, forgot previous internet, restarted router, restarted modem, switched to airplane mode and back. Nothing works. This started about a month ago. I am so frustrated. I cannot even really get online anymore or even update apps because my 5g connection blows.... suggestions?
Selected Answer
Mujibar
Honored Contributor
06-4-2026 03:11 AM
in
https://www.samsung.com/us/support/service/locations/
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Mujibar
Honored Contributor
06-4-2026 02:30 AM
in
usergwkri6oSW0
Constellation
10-4-2026 01:52 AM
in
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usergwkri6oSW0
Constellation
10-4-2026 02:01 AM
in
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edemunsta
Constellation
10-24-2026 03:14 PM
in
exactly, you can not even turn on wifi. I have replied to your original post for the actual solution that worked for me. Hope if works for you.
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RevengeOneUI
Nebula
06-4-2026 02:41 AM
in
1) Go to WiFi settings
2) press the three dots in the top right corner
3) scroll to the bottom, and unless connectivity labs is already there, press the intelligent wifi button a bunch of times until connectivity labs appears.
4) Press connectivity labs.
5) Scroll down to Customize Wi-Fi list settings and click on it.
6) move the slider at the top of the page to the show more position.
Let me know if that helps. If it does, please mark my response as a solution to help others with similar issues.
userOQlYz1En6L
Asteroid
06-4-2026 03:13 AM
in
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RevengeOneUI
Nebula
06-4-2026 03:16 AM
in
I don't think there's any other options sadly.
edemunsta
Constellation
10-24-2026 03:17 PM
in
I tried this but it did not help. But thank you for trying. I did find a solution for mine. I did a factory reset and wifi worked right away. This was last resort for me since I have tried every possible solution that did not work. Just remember to back up everything including photos before doing the factory reset.
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Samsung_Moderator
Community Manager
06-5-2026 02:04 PM
in
Hello, userOQIYz1En6L. Thank you for reaching out to the Samsung Community, and I am very sorry to hear about the ongoing frustration with your Galaxy S21.
I see that you have already completed a very thorough list of troubleshooting steps, including restarting your phone and router, forgetting the network, and toggling airplane mode. Since you have ruled out these standard software and network environment issues.
Because the hardware diagnostics are failing, it indicates that your phone's internal Wi-Fi antenna has encountered a hardware issue. When the antenna or Wi-Fi module experiences a failure, the device physically loses the ability to sustain a wireless local network connection, meaning standard troubleshooting will no longer work. To restore full functionality to your Galaxy S21, the phone will require a physical repair.
If you would like to set up a service repair to get your Wi-Fi antenna fixed, you can send us a direct message to this link {Send a Message}, or you can use the link below to contact a service center in your area.
https://www.samsung.com/us/support/service/locations/
TSL_NB
Constellation
06-16-2026 01:01 PM
in
This is a software bug, not an antenna problem.
Samsung deliberately pushed an update that's causing some kind of stuck Mutex when the GUI interface pushes to turn on the WiFi.
Samsung needs to publish a bugfix. THEY broke this.
WindRider
Asteroid
07-28-2026 11:34 PM
in
I fully agree with this! There is no way that all S21 phones are breaking at the same time and it is possible to get WiFi working again by clearing the cache partition.
WindRider
Asteroid
07-28-2026 11:33 PM
in
I've been having Wifi and Bluetooth issues on my S21 since the recent updates. What works for me is every time this happens, do the following:
There is some kind of software update affecting S21 phones that Samsung is failing to acknowledge.
edemunsta
Constellation
10-24-2026 03:11 PM
in
I had the same issue and could not find a solution months ago. I finally just upgraded to the s26 ultra and kept my s21 ultra 5G to see if I can fix it later. Since I had a working phone now, I was able to test and see if I can get it up and running again. After trying out all the other suggestions from everywhere that did not work, I finally did the last resort thing which is Factory Reset the phone. It worked! Wifi started working right away. Just remember that when you do a Factory Reset of the phone it will erase ALL data including pictures from you phone so always make a backup of all you data and photos just in case. Not sure if this will work for everyone, but it worked for me and wanted to share this.
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