What is a local SIM card?
A local SIM card is a SIM card that belongs to a certain network in a specific country. For example a local SIM card in Spain allows you to talk in Spain, being charged local rates, as opposed to tourist rates (i.e. roaming charges). When you travel to a certain country and put in your device a local SIM card for that country, you are in affect forgoing your agreement with your local provider back home, and using the device paying local rates.