Environment
Device: applicable to all
Onomondo app:
Network Lists
Network Logs
Question
Why does my device keep trying to connect to a network not included in the Network List, even though other operators should be available in the area?
I see repeated "Not allowed to connect" events in the Network Logs, all pointing to a single operator. There are other operators in the area which the device should have access to. Why does it not attempt attaching to those?
Answer
This can depend on many factors:
Network congestion,
Network temporarily unavailable,
Poor network signal,
Pre-set PLMN preferences on the modem (if any),
Recent Network List updates have not taken effect yet.
Cause
It is possible that the local operator may be prioritizing "home" SIMs over "foreign" / roaming SIMs under highly congested traffic conditions. This can happen when many devices within the same area are trying to join the network at the same time, fx. in urban areas with many active subscribers and infrastructure unable to handle all traffic at once. If the operator is rejecting the connection attempts before the request reaches Onomondo, we would not see it on our side (in Signaling Logs).
Any evidence from the modem could help us understand what is happening and why it seems that your device is only trying networks not included in the Network List.