Now we get crazy if a text is not answered in seconds. Many people were waiting for a letter from their loved ones for months. Did you know Roland Moreno wanted to present the SIM in the format of a ring? That was not practical, so he put it on a card and because of this amazing creation, our mobile phones are now connected to the internet.Īlthough the SIM card has been with us for over 40 years, there are a lot of things to learn about it: the types of SIM cards, all its functions and even what a dual SIM phone is and what it has to do with this chip.Ī long time ago, we were sending homing pigeons.
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