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The function of a SIM card is relatively simple. It's not a super advanced item that controls your phone, rather, it is basically nothing more than a storage device for information useable by yourself and your cellular carrier. It has limited memory to save this information. And this 'storage device' is also the reason you can use someone elses phone, put your SIM card into it and have all of your phone numbers and information about your account on their phone. This is of course unless their cellular provider has SIM-locked their phones. Anyways, long story short

SIM-Card = storage device.

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Q: What is the function of SIM card in telephone?
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Related questions

Do you have to use a SIM card?

When you get a sim card, it has it's own unique telephone number on it. When you insert the sim card you have that number. You can however get a code and keep your existing number and use it with a new sim card.


Whats telephone SIM card ...mean ..SIM ....mean?

SIM means Subscriber Identity Module.


Why you need sim card?

Without a sim card a phone will not be able to cornet to a telephone network. The sim card identifies you/your phone to the network provider, provides you with your telephone's unique number (so people can call you) and links you to your account so that you can be charged for the use you make of the telephone network.


Can a duplicate sim card of same number retrieve stored telephone old nos?

It depends where the numbers were stored. If they're in the phone's memory, inserting a duplicate SIM card should allow the user to retrieve them. If the numbers were stored on the old SIM card - then no.


Can a sim card have water damage?

Sim cards in telephone can indeed short out if they are in a telephone that gets wet. If a phone gets wet, shut it off immediately, remove the battery if possible and remove the Sim and SD cards.


What is the Alternate solution of SIM card?

Some mobile phones use SIM cards, other don't. The phones with SIM card slot allow the user to change the SIM; this way you can change the telephone number, or you can log to different networks (providers). SIM cards have not any alternative solutions.


Can you insert sim in your mts m blaze?

The MTS M Blaze is a USB-based modem. It uses a special SIM card in order to function. A person will not be able to insert a traditional SIM card into this particular router.


Why is my sim card reading invalid but works on my old one?

Your telephone is most likely locked for a single simcard.


If you lost your sim card for your phone do you have to get a new phone number?

Contact your carrier to determine this. Most carriers will allow you to purchase a replacement sim with the same telephone number.


Is there a sim card slot on the wifi PSVita?

You only need a SIM card if you've got a 3G version, and wish to subscribe to a 3G service. You do not need a SIM card at all for the wi-fi version, and if you had a 3G version but did not want a 3G subscription, you do not need a SIM card and it will function exactly like a wi-fi PSVita.


How do you make a inactive sim card to a active sim card?

You call your carrier and activate your sim card.


What is the plural of SIM card?

The plural form of SIM card is SIM cards.