Question: Which smartphone that was the first to support the emerging LTE Advanced mobile network standard also included S Voice?
Context: The XT Mobile Network is a UMTS and LTE mobile network run by Spark New Zealand (formerly Telecom New Zealand).  The network was initially built nationwide on WCDMA/UMTS 850 MHz, with 2100 MHz infill in major urban areas.  The UMTS network is HSPA+ enabled, with a maximum downlink transmission rate of 21.1 Mbit/s and an uplink rate of 5.2 Mbit/s attainable for capable hardware.  HSPA+ has a theoretical maximum of 56 Mbit/s download speed and 22 Mbit/s upload speed.  Then under Spark 4G LTE is being built out.  The network is not 2G capable, Telecom never operated a public GSM network. Voice over Long-Term Evolution (VoLTE) is a standard for high-speed wireless communication for mobile phones and data terminals.  It is based on the IP Multimedia Subsystem (IMS) network, with specific profiles for control and media plans of voice service on LTE defined by GSMA in PRD IR.92.  This approach results in the voice service (control and media planes) being delivered as data flows within the LTE data bearer.  This means that there is no dependency on (or ultimately, requirement for) the legacy circuit-switched voice network to be maintained.  VoLTE has up to three times more voice and data capacity than 3G UMTS and up to six times more than 2G GSM.  Furthermore, it frees up bandwidth because VoLTE’s packets headers are smaller than those of unoptimized VoIP/LTE. The HTC Evo 4G LTE is an Android smartphone developed by HTC Corporation to be released exclusively by Sprint.  A successor to the previous HTC Evo 4G and 3D models, the Evo 4G LTE supports Sprint's LTE cellular network and its current-generation EV-DO network.  The Evo 4G LTE shares features with its GSM counterpart, the HTC One Xsuch as the same dual-core 1.5 GHz processor used by the One X's LTE variant, a 4.7-inch screen, and Android 4.1 with HTC's Sense 4.0 interface.  The Evo 4G LTE was also the first phone built with an all aluminum frame, leaving only a small plastic piece to allow the Sim and micro sd cards to be installed. Reliance Jio Infocomm Limited, or Jio, is an LTE mobile network operator in India.  It is a wholly owned subsidiary of Reliance Industries headquartered in Navi Mumbai, Maharashtra that provides wireless 4G LTE service network (without 2G/3G based services) and is the only 'VoLTE-only' (Voice over LTE) operator in the country which lacks legacy network support of 2G and 3G, with coverage across all 22 telecom circles in India. LTE Advanced Pro (LTE-A Pro, also known as 4.5G, 4.5G Pro, 4.9G, Pre-5G, 5G Project, and so on) is a marker of the 3GPP release 13 and 14, which is a natural evolution of Long Term Evolution (LTE) with speed up to Gbit/s level which incorporated numerous new technologies that would be used in 5G standard, including 256QAM, Massive MIMO, LTE-Unlicensed, LTE IoT, and others to progressively evolve existing networks into 5G standard. S Voice is an intelligent personal assistant and knowledge navigator which is only available as a built-in application for the Samsung Galaxy S III, S III Mini (including NFC Variant), S4, S4 Mini, S4 Active, S5, S5 Mini, S II Plus, Note II, Note 3, Note 4, Note 10.1, Note 8.0, Stellar, Mega, Grand, Avant, Core, Ace 3, Tab 3 7.0, Tab 3 8.0, Tab 3 10.1, Galaxy Camera, and other 2013 or later Samsung Android devices.  The application uses a natural language user interface to answer questions, make recommendations, and perform actions by delegating requests to a set of Web services.  It is based on the Vlingo personal assistant. The Samsung Galaxy S4 is an Android smartphone produced by Samsung Electronics and was first shown publicly on March 14, 2013 at Samsung Mobile Unpacked in New York City.  It is the successor to the Galaxy S III which maintains a similar design, but with upgraded hardware and an increased focus on software features that take advantage of its hardware capabilities—such as the ability to detect when a finger is hovered over the screen, and expanded eye tracking functionality.  A hardware variant of the S4 became the first smartphone to support the emerging LTE Advanced mobile network standard. Orange Slovensko, a.s. is a Slovak mobile network operator, also offering fibre connections, since 15 January 1997 (previously named Globtel), when it became the first mobile operator in Slovakia to operate the GSM digital mobile network at the 900 MHz frequency.  On 15 November 1999, the company launched the commercial operation of the mobile network in the 1800 MHz frequency band.  It is also the first company to cover more than 66% of the country with 3G HSDPA high-speed internet with the maximum speed of 42 Mbit/s, launched the HSPA+ upgrade to the maximum of 21.2-42.2 Mbit/s in 2011.  The operator plans to commercially operate LTE network by the end of 2012. List of devices with LTE Advanced support.  LTE is a standard for wireless communication and LTE Advanced (Cat 6 or above) is a high speed version of LTE, sometimes marketed as LTE+, 4G+, 4GX, 4.5G or 4G LTE ULTRA.  LTE support varies from country to country, and the speed may vary depending on your location and how fast you are travelling.  The list below shows the devices that should support LTE Cat 6 and up. LTE Advanced is a mobile communication standard and a major enhancement of the Long Term Evolution (LTE) standard.  It was formally submitted as a candidate 4G system to ITU-T in late 2009 as meeting the requirements of the IMT-Advanced standard, and was standardized by the 3rd Generation Partnership Project (3GPP) in March 2011 as 3GPP Release 10.
Answer: The Samsung Galaxy S4