Technically you are right, the SIM card isn't roaming, but I am physically roaming outside of my home network (internationally).
Some phone plans in my home network do not support international roaming, or if they support then it is ridiculously expensive that it doesn't make any sense to take the phone roaming.
Some phone plans in my home network do not support international roaming, or if they support then it is ridiculously expensive that it doesn't make any sense to take the phone roaming.