Detection of whether a SIM card is inserted or not

Applications
#1

Is there a way (for scripting) to detect if a SIM card is inserted or not?
Scenario: If SIM card is removed, do this and that …

#2

I would check native Situations app for that.

#3

Maybe Dbus can help?

busctl introspect  org.ofono /ril_0 org.nemomobile.ofono.SimInfo
NAME                         TYPE      SIGNATURE RESULT/VALUE FLAGS
.GetAll                      method    -         isss         -
.GetCardIdentifier           method    -         s            -
.GetInterfaceVersion         method    -         i            -
.GetServiceProviderName      method    -         s            -
.GetSubscriberIdentity       method    -         s            -
.CardIdentifierChanged       signal    s         -            -
.ServiceProviderNameChanged  signal    s         -            -
.SubscriberIdentityChanged   signal    s         -            -

You could listen for the CardIdentifierChanged signal for example.

#4

This gives me (on XA2 SFOS 4.0.15) the same output for ril_1, but I have only one SIM inserted, the other slot has an SD card.
But /usr/bin/dbus-send --system --print-reply --dest=org.ofono /ril_0 org.ofono.NetworkMonitor.GetServingCellInformation returns something when registered, otherwise not.