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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. They started to attract mainstream attention. [8] [9]
A dual-mode phone is a telephone which uses more than one technique for sending and receiving voice and data. This could be for wireless mobile phones or for wired phones. There are three types of dual-mode phones.
The Universal Mobile Telecommunications System (UMTS) is a 3G mobile cellular system for networks based on the GSM standard. [1] UMTS uses wideband code-division multiple access (W- CDMA ) radio access technology to offer greater spectral efficiency and bandwidth to mobile network operators compared to previous 2G systems like GPRS and CSD . [ 2 ]
This is a list of all devices running Microsoft's Windows Phone 8.1 operating system. In addition to existing Windows Phone 8 partners HTC, Samsung and Huawei, Gionee, JSR, Karbonn, LG, Lenovo, Longcheer, XOLO, and ZTE signed on to create Windows Phone 8.1 devices in early 2014.
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.
A hybrid mobile phone can take more than one SIM card, even of different types. The SIM and RUIM cards can be mixed together, and some phones also support three or four SIMs. [15] [16] From 2010 onwards they became popular in India and Indonesia and other emerging markets, [17] attributed to the desire to obtain the lowest on-net calling rate.
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The phone has issues with AT&T's LTE network when users do not first insert a SIM card before going through the phone's setup procedure, [26] [27] Cortana can cause echoes during voice calls, [28] and the phone has been reported to have Wi-Fi issues. [29] Australian carrier Telstra has claimed the Lumia 950 has connectivity issues on their ...