I'm really having problem.Other phone gets easily connected to wifi but my a21s shows wifi only when 3 lines of wifi is available. I regret buying Samsung seriously
I'm not sure if your router is broadcasting 5GHz network, check your router specifications and settings. 5GHz will provide better transmission bandwidth, but the coverage is smaller compared to 2.4GHz networks, and that also depends on obstructions like walls. some routers allow to adjust the network strength. Since, you're having problem on a particular device, try resetting network settings, and connecting to another network, otherwise get the router settings checked by a network professional.
We acknowledge your query and apologize for the inconvenience caused to you and will surely assist you regarding the same. And please follow the easy troubleshooting steps which might help to solve the issue.
Note: Any prompt that says "Authentication Error" is related to an incorrect password. Please contact your Internet Service Provider for assistance regarding changing your Wi-Fi network password.
1: Settings >> Connections >> Wi-Fi >> W-Fi network >> Tap and hold the Wi-Fi network that you're having trouble with until the menu allows you to select Forget Network.
3: Restart the Router and Mobile Device. Switch off your Router (at the wall or with the power button on the router) and wait for 2-3 minutes before switching it on. While you're waiting, press the Power button on your mobile device and select Restart.
Once the router has been successfully connected to the internet again, try to connect to your network on your mobile device.
Make sure there is no interference between the router and your mobile device. Concrete walls, fridges, and microwaves can all interrupt the Wi-Fi signal.
4: Disable flight mode. Find the Airplane/Flight mode option and turn it off.
In case the issue still occurs. Please register your concern in Samsung Members Application (Open Samsung Members Application > Get help > Send Feedback > Error report).
Thank you for writing to us. Warm Regards, Samsung Customer Support.
