What is the best way to switch to a different network in case of such an error? Can the modem do this automatically?Īs there is currently no reference flow chart for the network connection establishment, here some useful hints I found in the meantime: No suitable cells in tracking area - This EMM cause is sent to the UE if it requests service, or if the network initiates a detach request, in a tracking area where the UE, by subscription, is not allowed to operate, but when it should find another allowed tracking area or location area in the same PLMN or an equivalent PLMN” The description of reject cause 15 is acc. The modem indicates a Network registration status (+CEREG) status 4 Unkown with a 15. Most probably, the roaming on the chosen network does not work because the IMSI provider and the network operator do not have a partnership (I'm about to verify this). With modem 1.2.0 I observed that the automatic network selection might select a network where roaming actually doesn't work, although there is a working one nearby (but with slightly lower signal strength).
I was wondering if there is any further reading about the Automatic network selection set as in the +COPS set command.Įspecially, I'm looking for a solution to choose the best roaming network.
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