Modem Stuck in 3G

Networking Solutions
1

Came back home to find that my RUTC50 was for some reason stuck in 3G (roaming). I am not roaming..

Restarted the connection and got back 5G straight away…

Why please ?

logs do not show anything related to 3G

there is no auto restart connection option I can find if network is 3G. only ping and wget

3

Greetings, @RollingStone,

Thank you for your question,

Could you please confirm which Preferred Network Type is set under Network → Mobile → Connection? If it is set to 3G/4G/5G, the device may have temporarily switched to 3G due to a short-term drop in 5G/4G signal strength.

You can adjust this setting in the same menu to force the device to prioritize 5G. Additionally, you can enable Low Signal Reconnect and configure the signal threshold, which will ensure the router reconnects only when the signal meets your specified criteria. This helps maintain a stable 5G connection.

I hope this helps! Please let me know if you have any further questions.

Warm regards,
V.

4

@Vilius.G

My connection is set to “5G/4G/3G auto”
there is no option to only have 5g

my comment is more on the fact that RUTOS should handle that better; the 3G mode was stuck for hours…

also something seems weird; as you can see in the screenshot below 5G N28 should be the better cell but the modem is connected to LTE B7. and it is set as primary by RUTOS Why is that please ? There is no option to set the primary to 5G N28

Screenshot 2025-12-09 at 17.12.46
Screenshot 2025-12-09 at 17.12.461533×917 102 KB

5

Hi,

Your device is connected in 5G NSA mode (Non-Standalone).
In NSA, 4G LTE is always the anchor (primary) and 5G is only an add-on (secondary) band.

6

Is there no way to force the device to 5G SA?

7

Is 5G SA available at your location? My understanding, from my brother, is that Free’s 5G SA (3.5Ghz) is only available around good-sized conurbations, otherwise coverage is on 5G NSA (700 MHz) or dropping to 4G if no 5G coverage.

Probably worth checking before you go down the ‘SA’ rabbit hole.

8

Greetings, @amadgwick,

Thank you for your message.

At this time, there is no option in the WebUI to force a connection to 5G SA (Standalone). In addition, establishing a 5G SA connection requires several conditions to be met, including the following:

  1. 5G SA radio availability
  • The serving cell must advertise NR Standalone access (SA SIBs present).
  • A 5G Core (5GC) must be reachable from that cell.
  1. SIM provisioning for SA
  • The SIM card must be authorized to register with the 5G Core (SA enabled in the subscriber profile).
  • The correct APN for SA/5GC must be permitted by the operator.
  1. Network policy allowing SA attachment
  • The operator must allow standalone access without LTE anchoring.
  • There must be no mandatory LTE dependency for control signaling, authentication, or emergency services.

I hope this clarifies the situation.

Warm regards,
V.

9

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