S21 plus - No internet in Dual sim mode

[Samsung21plus]

No internet access issue while phone is having 2sims. Motherboard replaced, device formated, software updated, reset phone settings but still having issue. 

Is anyone have solution?

[Dkr]

Bro can you explain in detail?

[Samsung21plus]

Phone internet with sim data works well in a single sim(never lags or nerve buffer), but when 2 sim card inserted data connectivity issues comes like video buffering, no internet access.
So, I have to switch off or either on/off airplane mode to use the internet, but that is too for some time, and the issue again started.

I visited the service center, they replaced the motherboard, and did device reset, software reinstalled but nothing resolved issues.

[Dkr]

Oh..sorry bro I haven't faced this issue before...contact them again they might do something

[naveenrao]

Bhai m.also facing same issue. Thay also changed motherboard bt still same issue.

[ѵօϲɑӀ4ӀօϲɑӀ]

Tried changing SIM cards?

[Samsung21plus]

I tried, but nothing worked...

[Anonymous]

Maybe the problem is in antenna bands, I am not sure whether it's a part of motherboard or not.

[Samsung21plus]

Yes, I think so and it's not a motherboard part

[Anonymous]

If it's in warranty, ask for a replacement of the phone. Have you taken your phone to service center for motherboard replacement? I suggest you to go to service center and explain everything in detail.