Beyond SIM card

                 Twitter is the language that "Switch on mobile phone is enough to escape the crisis of humanity". The smartphone in hand is just enough for us to get in touch with loved ones immediately and stay away from those who do not like.

           Some calls on the phone will make us happy; Some calls are provocative Some calls will serve love; Some calls can cause fear. Do you know how such SIM cards are running from cell phone to us?

                 Sim is a summary of the Subscriber Identification Module (SIM). The dictionary dictionary says SIM card is a subscriber identification module. Currently, mini, micro, and nano are used in many screens according to SIM slot on mobile phone.

                        In 1991, Giesecke & Devrient, the first in the city of Munich, created the SIM card. The size of the SIM card, then a credit card, was gradually reduced and then reduced to the size of the finger. There was also a space for other parts.

    Sims are generally needed for the most commonly used GSM phones.

       According to the International Card Producers' Organization, more than 700 million TVs are connected to the cellular network today. By 2016 alone, 540 million SIMs were produced.

     Everyone has seen a small chip on the back of the SIM card. This chip contains information about the network and the details of the subscriber. Without a SIM card, the GSM phone can not communicate with the mobile network. This international unique number varies with each SIM card like the fingerprint of man. By doing so, each SIM card can be uniquely identified in any corner of the world. Similarly, Authentication Key will have details such as a card lock but a PUK number that can be unlocked to ensure each SIM card is secure. In addition, SIM cards are now available to store temporary information, text messages, and contact numbers on the local network.

            When SIM card is turned into a mobile phone, the international unique number (IMSI), Authentication Key, sends a reverse to the tower near the mobile phone, to access the network. Both the network is tested and sent to encrypted information to check the SIM card. The wireless signal is available from the network only after the SIM card is correctly decrypted. Generally, when the new SIM card is turned on the mobile phone, this is why the signal is a little late (the signal will always wait a bit!). When you switch from one mobile to another, this is the same job. The SIMs called e-Sim (Embedded SIM) are believed to be much used in the future. This can not be changed as the SIM card is installed on the device. But this method is meant to help the mobile become more slim.

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