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  2. Dual SIM - Wikipedia

    en.wikipedia.org/wiki/Dual_SIM

    Dual SIM standby phones allow both SIMs to be accessed by using time multiplexing. When one SIM is in active use, for example on a call, the modem locks to it, leaving the other SIM unavailable. Older examples of dual-SIM standby phones include the Samsung Galaxy S Duos, [23] the Sony Xperia M2 Dual, [24] and the iPhone XS, XS Max and iPhone XR ...

  3. iPhone 15 - Wikipedia

    en.wikipedia.org/wiki/IPhone_15

    The iPhone 15 and iPhone 15 Plus are smartphones developed and marketed by Apple. They are the seventeenth generation of iPhones , succeeding the iPhone 14 and iPhone 14 Plus . The devices were announced on September 12, 2023, during the Apple Event at Apple Park in Cupertino, California alongside the higher-priced iPhone 15 Pro and 15 Pro Max .

  4. Roaming SIM - Wikipedia

    en.wikipedia.org/wiki/Roaming_SIM

    Some providers achieve this automatic call interception and callback by encoding a program onto the SIM card. Other providers use Multi-IMSI (International Mobile Subscriber Identity) technology to lower the cost of roaming. In this case, there is a program on the SIM card that selects the lowest cost IMSI (or 'profile') to use in a specific ...

  5. Roaming - Wikipedia

    en.wikipedia.org/wiki/Roaming

    In a country like India, where the number of regional operators is high and the country is divided into telecom circles, this type of roaming is common. Following the launch of the Pebble Network in the UK on 15 July 2015, national roaming has been possible across the major UK networks at no additional cost using a Pebble Network SIM card.

  6. eSIM - Wikipedia

    en.wikipedia.org/wiki/ESIM

    The first iPhone models to not have a SIM card tray and work exclusively with eSIM were the iPhone 14 and iPhone 14 Pro, announced in 2022. [20] Outside the United States, all iPhone models continue to be sold with support for physical SIM cards, but the iPad Air (6th generation) , iPad Pro (7th generation) , and iPad Mini (7th generation ...

  7. 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).

  8. International mobile subscriber identity - Wikipedia

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

    An IMSI is usually presented as a 15-digit number but can be shorter. For example, MTN South Africa's old IMSIs that are still in use in the market are 14 digits long. The first 3 digits represent the mobile country code (MCC), which is followed by the mobile network code (MNC), either 2-digit (European standard) or 3-digit (North American ...

  9. SIM lock - Wikipedia

    en.wikipedia.org/wiki/SIM_lock

    A SIM lock, simlock, network lock, carrier lock or (master) subsidy lock is a technical restriction built into GSM and CDMA [1] mobile phones by mobile phone manufacturers for use by service providers to restrict the use of these phones to specific countries and/or networks.

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