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2. Dual SIM - Wikipedia

   en.wikipedia.org/wiki/Dual_SIM

   [1] [2] In countries where dual SIM phones are the norm, people who require only one SIM leave the second SIM slot empty. 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 ...

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. Samsung Galaxy Duos - Wikipedia

   en.wikipedia.org/wiki/Samsung_Galaxy_Duos

   If SIM 2 is in use, a caller to SIM 2 will be redirected by the carrier network as though the phone were off or out of range. E.g., to voicemail. This is the default behaviour, and it is what happens if “Dual SIM Always On” is set to "Offline". Setting “Dual SIM Always On” allows a call on one SIM to interrupt a call on the other SIM.

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 ...