Slow cellular and Wifi Speed on Galaxy S21

[Robinthebest]

I'm from Hong Kong, just went to service center yesterday trying to get my phone fixed for slow network speed and Wifi speed, they said it is a motherboard issue and replaced it with a new motherboard.

But the issue still exists, I tried connecting to the same Wifi with S8, S9, S20FE, all have better download and upload speed than my S21, especially around 20mpbs on downloads.

Using cellular also has the same issue, at some spot if my S21 can't even browse any website, i plugged my sim into my S9, I can browse again, is it a faulty firmware and a faulty motherboard again?

I've been using Galaxy since S2, this issue alongside the overheating issue really gave me a very bad experience.

[AlenSony소니알렌]

May be the problem with latest patch update


Are u using beta version or one ui 4 beta 1 ..,???

[Robinthebest]

No, I am still on 3.1, i am waiting for the octopus patch, if the issue still exists i might go to the replacement centre again

[AlenSony소니알렌]

Octopus 😨update


October

Further updates can solve it

[Robinthebest]

lol i didn't notice that at all

anyways i hope so, as that was so annoying for me as I'm having a far superior phone

[VishnuAsok]

I see similar issues reported by multiple folks....Iam surprised motherboard replacement did not fix it.....Do you see the same problem with safe mode as well?

[Robinthebest]

Never tried it, but i thought a motherboard replacement should've fixed it? so whether am I is in safe mode shouldn't matter?

[Samsung_Support2]

Dear Samsung Member,

Greetings from Samsung Customer Support!

We acknowledge your query and apologize for the same. To resolve your device network issue please visit this link: https://www.samsung.com/in/support/mobile-devices/samsung-mobile-network-issues/#:~:text=1%20Check%2....  

In case the issue still occurs. Please register your concern in Samsung Members Application (Open Samsung Members Application > Get help > Send Feedback > Error report/Ask questions).

Thank you for writing to Samsung.

Warm Regards,
Samsung Customer Support

[Robinthebest]

The link is unavailable there