![]() ![]() In addition to the three main SIM card sizes, is the embedded SIM, or better known as the eSIM. Listed below are the sizes for each SIM format: These include a Standard, Micro, and a Nano SIM. There are three main SIM formats which are currently used within mobile phones. Now, the use of SIM cards allows a staggering 7 billion devices to connect to mobile networks, globally. Effectively, it was a turning point for mobile phones. Adopting GSM permitted users to connect to their chosen mobile network and make phone calls to users on other networks. GSM is a digital mobile network that is used widely by mobile phone users in Europe and across the globe. The company sold the first 300 SIM cards to the Finnish wireless network operator, Radiolinja.Īt the time of creation, Europe had adopted GSM (Global System for Mobile Communication) regulations. The first-ever SIM card was invented in 1991 by Giesecke & Devrient – a German-based smart card maker. For example, the IMSI is used to connect another user that is phoning your mobile number to your specific phone, rather than to someone else’s. As well as containing a mixture of information, they hold a unique ID, known as the International Mobile Subscriber Identity, which identifies your phone to the network. Essentially, this allows you to make calls, send SMS messages and connect to mobile internet services (such as 3G, 4G, 5G, etc.). In other terms, a SIM card is the middle point which connects your phone and network provider together. What is a SIM card?Ī SIM card, otherwise known as a subscriber identity module, is a small piece of plastic that slots into your mobile phone to allow you to communicate with your mobile phone carrier. ![]() We have put together a short guide which explains everything you need to know about SIM cards and answers the most commonly asked questions. The tiny piece of plastic slotted into the side of your device is crammed full with information that allows you to communicate with one another.Īre you wondering how a SIM card works? Then, look no further. ![]() But to make calls, send text messages, or use mobile data, you will need to insert a SIM card in order to connect to your mobile network. You use it to catch up with friends, check in with work emails, and capture life’s precious memories. ![]()
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