17-09-2021 01:02 PM
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Highlight
- Report Inappropriate Content
Hi,
I'm using an S21 5G and want to attach it to a private 5G SA network. First, the phone can detect the network and attach but after a while(some minutes) is dropped off. I already used this phone in a public None-SA network and there is no problem but it's not working in SA mode. we tested another phone from other brands and it also working in our private network without any problem.
I'll appreciate it if you support and let me know your comments.
17-09-2021 02:18 PM
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Highlight
- Report Inappropriate Content
You can reset the network on your phone, then it should show available networks and connect to your own network.
17-09-2021 02:40 PM
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Highlight
- Report Inappropriate Content
No, I mean private 5G cellular network, not WiFi, band N78.
17-09-2021 02:55 PM
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Highlight
- Report Inappropriate Content
Click on the three dots in the corner and the advanced, choose WiFi frequency band
Select 5ghz so that all networks using that band show up. You can now click on the preferred network.
18-09-2021 12:45 AM
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Highlight
- Report Inappropriate Content
05-11-2022 07:56 PM - last edited 05-11-2022 07:58 PM
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Highlight
- Report Inappropriate Content
A few months back I have encountered a similar issue as you when travelling to China, but it was with a commercial deployment of nation-wide SA-only 5G network (they have removed their NSA deployment), on N78. My phone was Fold 3 5G.
Inserting my SIM card to another device will allow 5G SA connection on that device, but having a working 5G SIM inserted into my device will not. I have consulted the carrier I was using, and they can see from their end that the device is SA-capable, and the network allows my device to connect to its network.
It appears that there is a switch under Developer Settings of devices sold in regions that have SA network deployed (e.g. China and RoK) called '5G Service Mode' that would allow the device to use the SA networks when it is available, and otherwise the device will not connect to any 5G SA network, with the only 5G option being NSA.
I believe there was a workaround if the device is One UI 3 or earlier, as there are some instructions and guides out there. Sadly, this is already a dead end starting from One UI 4. I have checked my Fold 4 and there is a property in the device that I cannot modify: "ril.supportSA", has value "0".
So, it is up to Samsung, to see if they are 'kind enough' to have 5G SA capability enabled in a future OTA, like they did to phones sold in Korea, providing that what they say is true - the device itself is SA capable.
