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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.
Amoy Solid is rebranded as My|Phone. [3] On January 3, 2007, Solid Group registered the MyPhone trademark with the Intellectual Property Office (IPO). Solid Group originally presented the brand to the market in September 2007. [1] [3] [5] MyPhone was the country's first mobile phone brand to offer dual active SIM functionality. [6]
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).
all versions, including dual SIM variant Xperia XA1 Plus: Android October 2017 all versions, including dual SIM variant Xperia XA1 Ultra: Android May 2017 all versions, including dual SIM variant Xperia XA2: Android February 2018 all versions, including dual SIM variant Xperia XA2 Plus: Android September 2018 all versions Xperia XA2 Ultra: Android
If the phone is stolen, it can be tracked by "find my phone" services, while a physical SIM can be removed. [34] The risk of damaging a SIM socket's delicate contacts inserting and removing a SIM is eliminated. Phones with eSIM only do not need to be built with hardware SIM holders or means to insert them.
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.
These phones include combination of GSM and CDMA technology. They can be used as a GSM or CDMA phone according to the user's preference. These handsets are also called global phones. An example of this is the Samsung SCH-A790. These dual-mode handsets are compatible with both GSM and CDMA networks and are essentially two phones in one device.
The phone, however, is also initially locked by the manufacturer into the Service Provider's MSL. This lock may be disabled so that the phone can use other Service Providers' SIM cards. Most phones purchased outside the U.S. are unlocked phones because there are numerous Service Providers that are close to one another or have overlapping coverage.
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