Question Network connection issues on One UI 4, can I downgrade? - Samsung Galaxy Z Fold3

I just bought the phone, its unlocked. I've tried multiple sims from different carriers, and they all have the connectivity issue. Can I downgrade to get rid of the problem or am I screwed?

How connectivity issues?
Wifi, cellular? Low singal, lost signals? Only emergency calls?
Are you write more about this problems?
And next how version software are you have?

My network goes out completely randomly, wifi is fine, it's just cellular.
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Related

[Q] Emergency Calls only, but 3g working

Hey guys, i need a little help with my Galaxy Nexus, i tried all fw (stock and customs), all kernels and radio's firmwares,and is always the same...
EDGE/3G working, 'no signal' and Only Emergency Calls. currently is with CM11 and shows signal, 3g etc, but i cant do calls... Does anyone know what should be the problem?
sorry for my -very- bad english
Here, an image of the test menu:
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Slow network speed.

I have recently experiencing low data speed in both mobile data and WiFi. I have asked my other family members and they said thay are having normal speed through WiFi on their devices. My device is 820u on latest stock android 5.0.2 with bootloader locked and non-root. Does anyone has any ideas on why I am experiencing this?
P's I use slot 1 for my data sim and no 3rd party wifi apps installed.
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Sent from my hTC D820u via Tapatalk

11.0.0.2.HD65BA - Wifi Calling is working?

I really want to try and install this OTA, but my home doesn't have any reception.
So i have to use Wifi Calling feature (which works great after using the guide on the site).
Someone tried Wifi Calling and it works for him?
The option is available, but in my house I have excellent signal, so I can't know if it works
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for me there are intermittent issues with loosing the ability to call out on every version of Oxigen after 10.0.13
I recommend downgrading to that. Once I can I'm getting off oneplus as this has been a terrible experience.

OnePlus 7T Force LTE (Unlocked AT&T)

The guy at the AT&T Store told me that since the 7T detects 2G & 3G, it'll automatically prefer those networks. Even after trying to manually register the network operator as AT&T 4G and trying to the "LTE Only" (pictured below) selection, I'm still stuck without and cell service. Any ideas?
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LTE physical channel configuration

Hi!
Can someone tell me what the message in LTE Physical Channel Configuration means?
I only get H+ when turning mobile data on although my SIM supports 4G.
My girlfrind has a2 lite too. On her phone the LTE PCC is blank and she has 4G.
I never had 4G on my phone only 3G.
Can you please help me to enable it on my phone?
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