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2. SIM card - Wikipedia

   en.wikipedia.org/wiki/SIM_card

   Dual SIM devices have two SIM card slots for the use of two SIM cards, from one or multiple carriers. Multiple SIM devices are commonplace in developing markets such as in Africa , East Asia , South Asia and Southeast Asia , where variable billing rates, network coverage and speed make it desirable for consumers to use multiple SIMs from ...

3. Dual SIM - Wikipedia

   en.wikipedia.org/wiki/Dual_SIM

   Dual SIM phones usually have two unique IMEI numbers, one for each SIM slot. Devices that use more than two SIM cards have also been developed and released, notably the LG A290 triple SIM phone, [3] and even handsets that support four SIMs, [4] [5] such as the Cherry Mobile Quad Q70. [6]

4. GSM - Wikipedia

   en.wikipedia.org/wiki/GSM

   A nano sim used in mobile phones. One of the key features of GSM is the Subscriber Identity Module, commonly known as a SIM card. The SIM is a detachable smart card [2] containing a user's subscription information and phone book. This allows users to retain their information after switching handsets.

5. List of mobile virtual network operators in the United States

   en.wikipedia.org/wiki/List_of_mobile_virtual...

   Providers supporting multiple host networks use only one of them for each device, depending on the specific phone model and/or SIM card used (except for Google Fi Wireless, which switches automatically between the different listed host networks based on factors such as relative signal strength). [4]

6. Turbo SIM - Wikipedia

   en.wikipedia.org/wiki/Turbo_SIM

   However, dual SIM technologies have been found not to work with some phones. This device, and those like it, use a small microcontroller (the original Turbo SIM used an Atmel ATmega128) to intercept traffic between the cell phone and the original SIM card, and modify this traffic based on programming stored in the microcontroller. [3]

7. Mobile phone feature - Wikipedia

   en.wikipedia.org/wiki/Mobile_phone_feature

   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. A SIM card contains its unique serial number, internationally unique number of the mobile user , security authentication and ciphering information, temporary information ...

8. AOL Mail

   mail.aol.com

   Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

9. GSM modem - Wikipedia

   en.wikipedia.org/wiki/GSM_modem

   The SIM card provides the module with a unique identification number, which is used to identify the device on the network. The GSM module then communicates with the network using a set of protocols, which allows it to send and receive data. The GSM network is a digital cellular network that uses a set of protocols to enable communication ...