What is a SIM card?

If you have a cellphone, you may know that you need a SIM card or the phone won’t work. But what exactly is the SIM card, and why do our phones need one?

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More Vaageesha Das

Vaageesha Das
What happens when rocks get close to the sun
Why and how do meteor showers occur?When it comes to Solar System, in addition to the planets, there are other objects orbiting the sun.
September 21, 2018 - 11:41 pm
Vaageesha Das
Roads have seen much change
By Vaageesha DasWhat are roads made of?Some roads are bumpy because they are filled with potholes.
August 11, 2018 - 8:38 am
Vaageesha Das
Microwaves are more complex than we think
By Vaageesha DasWhenever we are hungry and in need to heat some food up, we usually use the microwave.
July 28, 2018 - 8:45 am
Vaageesha Das
I've bin recycling, have you?
What happens during the recycling process?We are always told that recycling helps the planet and that we should recycle whenever we can.
July 13, 2018 - 6:44 pm