eSIM: No more Mini, Micro and Nano-SIM Cards, all you need to know about eSIM

eSIM, the subscriber identity module (SIM or simply “chip”), the basis of phone calls has seen many changes over the years. From 1991 to 2012 this development occurred in the area of ​​physical size and data storage capacity. Hence, the traditional SIM card types are still the same throughout these long years of evolution.

Let’s dive into the various sizes and related names of the SIM card used.

The first SIM card module, introduced in 1991, was ready. By full size, I mean the size and type of bank card (ATM credit or debit card) today. This SIM card was used as an ATM card because cell phones looked like ATMs at that time. They are called “full” SIM cards. Those who have used a Telecom (now Vodafone) card and those who have used the SHS while using the phone booth know exactly how to use this SIM card.

The second model appeared in 1996 as a “mini” SIM card. This card is just a cut from the complete. This particular model is still used by most of the working phones (“Yam” phones) today. This is the largest SIM card we have today. Everyone has probably seen it before.

The third model is known as the “Micro” SIM, which was introduced in 2003. As usual, this model is just a reduction model from the previous mini-SIM. However, the micro SIM card supports almost the same width as the mini-SIM card, but we see a significant drop in height. This particular model became important due to the advent of smartphones. It’s first used in Apple’s iPhone 4 smartphone.

The fourth model is known as Nano-SIM and was launched in 2012. This particular model has been significantly reduced in terms of height and width compared to other models. This change is necessary because of the need for a shiny and built-in type cellphone battery. Since smartphone motherboards have to be made smaller to accommodate the larger built-in battery, components and connections such as the SIM slot have to be reduced.

All You Need To Know About eSIM

Since the traditional SIM chip is immutable from the one on the Nano, a different form of SIM architecture is required. For this reason, a new SIM technology called eSIM was created in 2016. The “E” here means “embedded”. ESIM means internal SIM card.

It is known as a built-in SIM card because the architecture of this SIM card is similar to an integrated circuit (IC). This integrated module is then integrated or connected to the cellphone motherboard (by the cellphone manufacturer). It will make us wonder how we can ever use our number on such a phone. Well, the designers took all this into account and made the onboard chip programmable.

This means that after buying a smartphone with eSIM support, you only need subscription data from the network operator in the form of a QR code. Once you have it, you can simply use the eSIM Settings app to scan the QR code. This process programs the eSIM with your customer data and like your SIM card. All your contacts and everything from your actual SIM card will be transferred to this chip. Very simple and easy.


Welcome to the Global News Nigeria, I am a blogger and a video editor in Nigeria, My aims and objectives are to share knowledge and varieties of news, sports and information across the globe.

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