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2. SIM card - Wikipedia

   en.wikipedia.org/wiki/SIM_card

   SIM cards are identified on their individual operator networks by a unique international mobile subscriber identity (IMSI). Mobile network operators connect mobile phone calls and communicate with their market SIM cards using their IMSIs. The format is: The first three digits represent the Mobile country code (MCC).

3. Dual SIM - Wikipedia

   en.wikipedia.org/wiki/Dual_SIM

   Dual SIM. A modern Samsung Galaxy phone with two SIM card slots. It uses nano-SIM instead of the normal sized SIM. Some mobile phones support use of two SIM cards, described as dual SIM operation. When a second SIM card is installed, the phone may allow users to switch between two separate mobile network services manually, have hardware support ...

4. Mobile phone - Wikipedia

   en.wikipedia.org/wiki/Mobile_phone

   The SIM securely stores the service-subscriber key (IMSI) and the K i used to identify and authenticate the user of the mobile phone. The SIM card allows users to change phones by simply removing the SIM card from one mobile phone and inserting it into another mobile phone or broadband telephony device, provided that this is not prevented by a ...

5. The next generation of phones will make SIM cards obsolete

   www.aol.com/article/2015/07/17/the-next...

   The SIM card is what connects a cellphone to the network, but since it's proprietary of each one, it is a pain to use when traveling and you need to switch from one carrier to another.

6. International Mobile Equipment Identity - Wikipedia

   en.wikipedia.org/wiki/International_Mobile...

   The phone identifies the subscriber by transmitting the International mobile subscriber identity (IMSI) number, which is stored on a SIM card that can, in theory, be transferred to any handset. However, the network's ability to know a subscriber's current, individual device enables many network and security features. [citation needed] Dual SIM ...

7. Phone cloning - Wikipedia

   en.wikipedia.org/wiki/Phone_cloning

   GSM cloning occurs by copying cracking a secret key from the victim SIM card, typically not requiring any internal data from the handset (the phone itself). GSM handsets do not have ESN or MIN, only an International Mobile Equipment Identity (IMEI) number. There are various methods used to obtain the IMEI.