Mobile Phone SIM Cards

Upon inserting a SIM card into a handset, a user can save a number of contacts and make calls and send text messages to them as a way of keeping in constant communication.

A user would need to use a SIM card. It is inserted into the user’s mobile phone. A SIM card allows one to connect to their preferred network operator.

Nonetheless, for a user to make calls, send a text message (cellular text messages) and use mobile data to connect and browse the internet.

Though a smartphone comes with awesome features among them a super brilliant camera, GPS, fingerprint scanner, Wi-Fi, sensors and many more cool features that are made in a manner that ensures a smooth and easy user interface.

A SIM card is one accessory you simply can’t afford not to have especially if you own a phone or a tablet. It is what enables phone calls, sending and receiving texts and browsing using data in a phone to be possible.


Subscriber Identification Module


A Subscriber Identification Module (SIM) is an integrated and complex circuit that is made into a finger nail sized chip and is intended to securely keep the identity of a mobile subscriber.

A SIM card makes it possible to store contact information of other mobile subscribers.

Through this feature made possible by the complex finger nail sized chip, smartphone users are able to make calls to other people in their contact list.

To put it simply, a SIM card acts as an intermediary or a middleman between a phone’s hardware and the user. It allows an individual to be in a position to travel between phones.

Case in point, if one upgrades to a new iPhone, the SIM card that they had previously travels provided the slots of the old and new phone are the same size.

A SIM card plays the role of informing the phone that you as a user has an active network service.

It will also serve the crucial role of holding important account information that is transferable.

The information can be shared with another user if an individual decides to share the information.

The SIM card also has the capacity to store the information and display it when inserted to another mobile phone.

It works both as a middleman and a storage device for information at the same time.

many sim cards

International Mobile Subscriber Identity

SIM cards are essentially identified using international subscriber identity.

Mobile operators are able to connect mobile phone calls and keep in touch with their SIM cards using the international subscriber identity.

SIM cards have a similar identical format which is;

The first three numbers which are a representation of the Country Code.

It is important to note that the first three numbers vary from one country to another.

The next two numbers represent the network provider. Different providers use unique numbers that identify the provider.

The subsequent digits identify the individual user. These digits are normally unique to a user and seldom can many people have identical numbers.

Normally there would be 10 digits in total but in some instances, they could be fewer depending on a nation’s regulations.

Types of SIM Cards

In a general sense, there are three types of SIM cards that are being used to date bearing in mind the advancement of technology to this day. 

The three types are; a Standard SIM Card, a Micro SIM card which is smaller in size and the Nano SIM which is the smallest of the three types.

The type of SIM Card that will work for a given user is entirely dependent on the type of mobile phone or handset that they have purchased.

However, it is worth noting that there ways that a SIM card can be made to be fit for whichever phone that you as a user have.

Different SIM card sizes

Standard SIM Card

The first sim card as well as the oldest of the three existing types of SIM cards. They were popular and in use prior to 2010.

It measures about 2.5CM by 1.5CM. As of now a number of new phones that are being released to the market barely features a slot enough for this size of SIM cards.

However slots for Standard SIM can be found in basic phone features.

Micro SIM Card

The noticeable and only real variation between the standard and Micro SIM is the size of the plastic that encompasses the microchip.

The primary goal of a Micro SIM was to ensure that the quest to make smartphones lighter and slimmer was achieved.

The Micro SIM measures a mere 15 by 12 mm. a considerable smaller size compared to the Standard SIM card.

These type of SIM cards were introduced in 2010 as a successor of the Standard Sized SIM cards.

Nano SIM Card

As pointed out earlier Nano SIM cards are the smallest size of the three types of SIM cards.

The type was introduced in 2012. A massive number of new smartphones have been in a manner that only allows the use of this small sized SIM cards.

New high-end Samsung phones and the latest iPhones and other brands of phones feature slots for these SIM cards that measure 12.3 by 8mm.

Combi SIM Card

This a type of SIM card that allows a user to easily break extra plastic if they need a smaller SIM for their phone.

Combi sim allows network provides to cater for the needs of more phone users with a single card.

Most SIM cards from outlets are made in this format as it is more convenient and efficient both for the users and the network providers who would not have to incur the expense of producing different types of SIM cards.

How To Modify Your SIM Card

Sometimes as a user one might be at a point where they want to revert to using an older handset yet in their possession is a micro sim.

In such a scenario a user can purchase an inexpensive adapter from known retailers such as Amazon or even at a close store to them.

One can convert a Nano SIM card to a Micro SIM. Adapter merely provides extra plastic needed to ensure a SIM card is securely fitted in the slot of a given handset.

sim cards sizes

Resizing a SIM Card Size

If a SIM card is bigger for your new handset, there is a way you can make it smaller.

Whilst, this is an effective way, it is incumbent that a user ensures that they are careful as they trim extra plastic.

One can choose from a host of tutorials on YouTube on how to trim a SIM down to size.

Doing it right can help a user in saving them the hustle of having to purchase a new SIM card that they are not accustomed to.

However, one needs to be careful when manually resizing their cards, if as a user you damaged the chip, the SIM card will no longer work.

Benefits of a SIM

SIM cards as explained earlier, are like a crucial middle man who enables you to achieve something.

They make connections between network as such enabling people to call each other over a network, send text messages and also be in a position to use mobile data in accessing and browsing the internet.

When you buy a new handset you simply insert the existing SIM provided the slot is similar to that of the old phone.

If the slots are not the same one can resize the SIM so as to fit the new handsets but they have to be careful in the process lest they spoil the SIM card.