This section provides an overview for sims as well as their applications and principles. Also, please take a look at the list of 9 sim manufacturers and their company rankings.
Table of Contents
A SIM card is a small IC card attached to a smartphone. The SIM card contains the contract information of the person who signed the contract for the smartphone, including the phone number, smartphone identification number, and e-mail address.
When you change the model of your smartphone, the SIM card allows you to use the new smartphone immediately by simply inserting the SIM card into the new smartphone without having to re-enter the contract information into the new smartphone every time you change the model of your smartphone.
When replacing e-mail, photos, and various application setting information with a new phone, a copy of the data must be made.
The various services offered by SIM cards depend on its type; the services offered by SIM cards consist of voice calls, data communications, and SMS services.
SIM cards with voice, data, and SMS services are voice service SIMs.
A data communication service SIM allows only data communication. Choose this type of SIM if you will use it only to browse the Internet using a browser.
The third service style is a service that provides data communication in addition to SMS. This type of service only does not allow voice calls, but it does allow use of the Internet through a browser and exchange services via SMS.
Selecting the SIMs service that best fits your smartphone usage pattern will also help keep costs down.
Traditionally, smartphone services were provided only by the major telecommunications carriers. There are now operators that borrow the communication lines of these major telecommunications carriers and offer their own services at low prices. These operators are called mobile virtual network operators (MVNOs).
MVNOs do not own their own communication lines, so their lifeline is the provision of features of their services. By combining voice, data, and SMS services, MVNOs offer unique low-cost services. SIMs that offer these features of service at a low price are called a low-cost SIMs.
Major telecommunication carriers focus on service plans targeting standard smartphone users. Therefore, MVNO services are advantageous for users with special usage needs, such as those who mostly use communication services to browse the Internet and never make phone calls.
For example, major telecommunications carriers have rules such as a two-year contract with a penalty fee if the contract is terminated within two years of the start of the contract, but in the majority of cases, MVNO services allow users to contract and terminate the contract freely.
The term "cheap SIMs" is often used to refer to SIMs that offer a variety of services at lower rates than those offered by cell phone companies.
Companies that offer low-cost SIMs are generally called "MVNOs."
MVNO stands for Mobile Virtual Network Operator, means virtual mobile network operator.
The term "MVNO" refers to companies that lease communication lines from NTT DoCoMo and other cell phone companies to provide inexpensive SIMs.
Since the first MVNO appeared in Japan in 2001, various MVNOs are now providing communication services.
The reason why MVNOs are able to provide various services at low rates is that they are able to provide various services at low prices by borrowing communication services from major cell phone companies, without having a large communication infrastructure of their own.
A SIM-free handset is a handset that does not have a SIM lock imposed by a cell phone company.
By using a SIM-free handset, you are not tied to a single cell phone company and can use a variety of SIM cards.
First of all, you need to make sure the handset is unlocked and SIM-free.
Most smartphones and cell phones cannot communicate unless a SIM card is inserted into the device itself, which is equipped with communication functions.
Smartphones and cell phones sold by domestic cell phone companies are stored with the SIM locked.
If you need to unlock the SIM, go to a cellphone store and ask them to handle the unlocking.
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