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2. Dual SIM - Wikipedia

   en.wikipedia.org/wiki/Dual_SIM

   The first phone to include dual SIM functionality was the Benefon Twin, released by Benefon in 2000. [7] More dual SIM phones were introduced in about 2007, most of them coming from small Chinese firms producing phones using Mediatek systems-on-a-chip. They started to attract mainstream attention. [8] [9]

3. Dual-mode mobile - Wikipedia

   en.wikipedia.org/wiki/Dual-mode_mobile

   These dual-mode handsets are compatible with both GSM and CDMA networks and are essentially two phones in one device. Such phones make sense in those countries that have both GSM & CDMA networks or international CDMA roamers who want to keep a single handset with two numbers on it. Most dual-mode handsets require two identifying cards (one SIM ...

4. SIM card - Wikipedia

   en.wikipedia.org/wiki/SIM_card

   A typical SIM card (mini-SIM with micro-SIM cutout) A SIM card or SIM (Subscriber Identity Module) is an integrated circuit (IC) intended to securely store an international mobile subscriber identity (IMSI) number and its related key, which are used to identify and authenticate subscribers on mobile telephone devices (such as mobile phones and laptops).

5. T-Mobile customers: Your phone plan might change - AOL

   www.aol.com/t-mobile-customers-phone-plan...

   It’s not clear how long customers have to opt out of the switch, but you have to call customer service to avoid it.

6. List of NFC-enabled mobile devices - Wikipedia

   en.wikipedia.org/wiki/List_of_NFC-enabled_mobile...

   all versions, including dual SIM variant Xperia C4: Android June 2015 all versions, including dual SIM variant Xperia C5 Ultra: Android August 2015 all versions, including dual SIM variant Xperia E3: Android September 2014 all versions, including dual SIM variant Xperia E4g: Android April 2015 E2003 Xperia E5: Android June 2016 all versions ...

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 ...