STJグループ（株式会社サンテレコムジャパン、株式会社STJレンテック） List of Products and Services

An eSIM is a system that allows users to utilize communication carrier services using a digital SIM embedded in devices such as smartphones. It enables online contracts and immediate activation, and it also supports dual SIM functionality, leading to an increase in companies adopting it for corporate contracts. In this column, we will provide a detailed explanation of the basic mechanism of eSIM, its advantages and disadvantages, as well as recommend models for corporate use and how it integrates with Mobile Device Management (MDM). *For more details on the column, you can view it through the related links. Please feel free to contact us for more information.*

Unlike mobile phones, radios (transceivers) that allow for group communication with a single button are invaluable in various situations. Just by having a radio, information can be shared quickly at any time, and its broadcast capability and immediacy greatly contribute to improving work efficiency. There are various types of radios, but one that has recently gained attention is the IP radio application that utilizes mobile phone network communication areas. In this article, we will introduce the types and features of conventional radios, compare conventional radios with IP radio applications, highlight the unique features of IP radio applications, provide case studies, and finally introduce the IP radio applications we offer. *For detailed content of the column, please refer to the related links. For more information, feel free to contact us.

Smartphones are essential items that support business efficiency and communication both inside and outside the company. However, what if important data leaks to the outside due to loss or theft? Just imagining it is chilling, isn't it? To reduce such risks, Apple's security feature "Activation Lock" is gaining attention. In fact, this feature is quite useful for managing corporate smartphones as well. "What exactly is Activation Lock?" "How do you use it?" In this article, we will clearly explain its mechanism, benefits, and how it can be utilized for corporate purposes. *For more detailed information, please refer to the related links. Feel free to contact us for further inquiries.*

Many people are preparing for disasters. Communication disruptions are one type of disaster. In this column, we will introduce methods to prepare for communication disruptions, specifically DSDS (Dual SIM Dual Standby) and secondary line services. When a communication disruption occurs suddenly, important data may become impossible to send or receive, and systems may come to a halt. Are you fully prepared for such situations? One way to prepare for such circumstances is through communication redundancy. *For more details on the column, you can view it through the related links. Please feel free to contact us for more information.*

Last year, Apple announced the generative AI feature "Apple Intelligence," which became a major topic of discussion. The long-awaited Japanese version has finally arrived in April 2025! It's different from the previous Siri, packed with convenient features that make daily tasks much easier, such as assisting with the creation of text and images. In this article, we will clearly explain how to utilize Apple Intelligence in business settings, along with important points to consider. *For detailed content of the column, you can view it through the related link. For more information, please download the PDF or feel free to contact us.*

On April 10, 2025, KDDI launched the "au Starlink Direct" communication service, which allows smartphones to connect directly to satellites, through collaboration with SpaceX. As a result, in areas where the sky is visible, it will be possible to exchange messages even in mountainous regions, remote islands, and disaster sites where communication has previously been difficult or temporarily unavailable. In this column, we will delve into the details of "au Starlink Direct," focusing on the basic mechanisms of satellite communication, how to use it on compatible devices, and the setup procedures, all explained in an easy-to-understand manner. *For more detailed information, please refer to the related links. For further inquiries, feel free to download the PDF or contact us.

In the era of digital transformation, as companies are required to improve productivity and streamline operations, the iPad is gaining attention as a solution. Not only is it portable, but its excellent operability and the abundance of business-oriented apps support operations in various settings. In this column, we will introduce the features of each iPad model, recommended accessories, and apps that are useful for business. There are also case studies of companies that have achieved digital transformation through the use of iPads, so please read until the end. *For more detailed content of the column, you can view it through the related links. For more information, please download the PDF or feel free to contact us.*

In the era of digital transformation, as companies are required to improve productivity and streamline operations, the iPad is gaining attention as a solution. Not only is it portable, but its excellent usability and the abundance of business-oriented applications support operations in various settings. In this column, we will introduce the features of each iPad model, recommended accessories, and useful applications for business, as well as specific examples of companies that have achieved digital transformation through the use of iPads. *For more detailed content of the column, you can view it through the related links. For more information, please download the PDF or feel free to contact us.*

While digital transformation (DX) is progressing in factories and construction sites, the use of smartphones and tablets is strictly limited in "explosion-proof areas" such as oil and gas plants and chemical factories. This is due to the risk that sparks and heat can lead to serious accidents. Traditionally, expensive explosion-proof smartphones were the norm, but in recent years, a new option has emerged: "attaching explosion-proof cases to existing iPhones." This column will provide a detailed explanation of the basics of explosion-proof technology, an overview of the standards, and the benefits of implementation. *For more details on the column, you can view it through the related links. For further information, please download the PDF or feel free to contact us.*

The other day, I had the opportunity to actually touch explosion-proof smartphones at an exhibition. What kind of image do you have when you hear "explosion-proof smartphone"? To be honest, I had the impression that it would be a "smartphone designed to prevent explosions," which I thought would likely be large, focused on protection, and lacking in usability and design. However, after seeing, touching, and comparing explosion-proof smartphone cases from multiple manufacturers, my impression changed significantly. In particular, I felt clear differences in design philosophy and usability between overseas and Japanese products, even though they were all explosion-proof smartphone cases. This time, instead of a specialized explanation about explosion-proof technology, I would like to share my honest impressions based on my experience at the exhibition. *For more detailed content of the column, you can view it through the related link. For more information, please feel free to download the PDF or contact us.*

As the places of work diversify, opportunities to work in various environments such as home, on the go, and at client locations are increasing, not just in the office. On the other hand, there are many situations where a single laptop is insufficient in screen space, leading to limitations in work efficiency. Mobile monitors are gaining attention as a means to solve these issues. However, if you choose incorrectly, it may end up being "an unused piece of equipment." This article explains the key points for selecting a mobile monitor without making mistakes. We will also introduce recommended models, so please read to the end. *For more detailed content of the column, you can view it through the related links. For more information, feel free to contact us.*

Recently, smartphone prices have been steadily rising. More companies are considering purchasing used devices to keep costs down when introducing smartphones for business use. However, there are important considerations when buying used devices. One of these is the "condition of the device" (which indicates the state directly related to the use of the device, such as whether it can connect to networks or if it is locked), which is not apparent to the buyer. If not properly understood, this can lead to serious troubles, including information leaks. Recently, there has been an increase in cases where devices are purchased through individual sales platforms like Mercari, Yahoo Auctions, and flea market apps, but this poses a very high risk for corporate use, so caution is necessary. This article will provide a detailed explanation of the risks and precautions associated with purchasing used devices. *For more detailed information, please refer to the related links. Feel free to contact us for further inquiries.*

We would like to introduce a case study of the implementation of our BPO service "MaruMoba" at Yoshizumi Holdings, where business smartphones are utilized across many departments, from sales and consulting to engineering. Before the implementation, when devices were needed internally, initial setup and accessory preparation were carried out, and the devices were lent to users. When devices were returned by departing employees, their condition was checked, and they were initialized and maintained before being stored. Now, returned devices are sent directly to our company, and we have transitioned to a system that handles everything from condition checks to management and redistribution in one go. Inventory status is also visualized in real-time, the area around the cabinets is organized, and the overall outlook for management operations has greatly improved. [Challenges] - Checking the condition of returned devices, performing initialization and maintenance, and handling storage - While remote work is the focus, staff members were still required to come to the office once a week, leading to ongoing demands on their time. *For more details, please download the PDF or feel free to contact us.*

We would like to introduce a case study of the "Comprehensive Mobile Business Support Service (Marumo)" in the telecommunications and information communications industry. The company faced challenges such as wanting to manage mobile devices in bulk using a Mobile Device Management (MDM) system, but lacking personnel with the necessary knowledge in-house. After implementation, by using MDM to collectively handle the previously time-consuming device setup tasks, the delivery time was shortened, and smooth distribution of devices to each employee was achieved. [Case Overview] ■Challenges - Large-scale kitting is difficult - Lack of MDM knowledge is putting pressure on operations ■Effects - Significant reduction in errors - MDM professionals handled the situation, reducing the burden on the management department *For more details, please download the PDF or feel free to contact us.

We would like to introduce a case study of the "Comprehensive Mobile Business Support Service (Marumo)" in the energy solutions industry. The company faced challenges as they were overwhelmed with other tasks such as PCs, networks, and business systems, which left them unable to manage smartphone-related operations. After implementation, all individual kitting that was previously done in-house was entrusted to us. By shipping directly to users without going through the management department, we were able to shorten delivery times. 【Case Overview】 ■Challenges - Wanted to delegate management tasks and consolidate requests and inquiries - Business operations were being strained ■Effects - Significant reduction in errors - Easier progress and management checks, reducing the burden on the management department *For more details, please download the PDF or feel free to contact us.

We would like to introduce a case study of the "Comprehensive Mobile Business Support Service (Marumo)" and "STJ Fault Support (i) 1 Year" in building comprehensive management. The company previously submitted repair requests through the internal device management department via the telecommunications provider when smartphones malfunctioned, but faced challenges such as time consumption. After implementation, by outsourcing the fault response contact point to our company, it became possible to handle repair reception from users, arrange spare devices, and collect faulty equipment in a one-stop manner. [Case Overview] ■Challenges - Need to reduce processes - Lack of knowledge about MDM, leading to operational pressure ■Effects - One-stop response - MDM professionals handle the situation, reducing the burden on the management department *For more details, please download the PDF or feel free to contact us.

We would like to introduce case studies of the "Comprehensive Mobile Business Support Service (Marumo)" and "OptimalBiz (MDM)" in the machine processing business. The company contracted an MDM provided by a telecommunications carrier when introducing business terminals, but faced challenges such as lacking the know-how for environment setup, which limited its utilization. After implementation, by utilizing MDM operation support, they achieved reliable operation with comprehensive support. Tasks that are prone to occur, such as settings and management information changes, can now be completed in-house. [Case Overview] ■Challenges - Difficulties in managing devices - Lack of knowledge about MDM ■Effects - Automation with MDM tools - Support from MDM professionals *For more details, please download the PDF or feel free to contact us.

We would like to introduce a case study of the "Marugoto Mobile Business Support Service (Marumo)" implemented in welfare equipment and home care support services. The company was considering vendors that could provide comprehensive support, from device procurement and kitting to MDM operation support and device storage. After implementation, our staff, who have extensive expertise, handled inquiries, resulting in quick responses and early resolutions to questions that previously took time to address. [Case Overview] ■ Challenges - Setting up, procuring, and managing business devices ■ Effects - Improvement in internal service levels - Reduction of the burden on internal management departments - Workflow applications decreased to one-third of the previous volume *For more details, please download the PDF or feel free to contact us.

The "iPhone SE (3rd generation)" achieves comfortable operability and long battery life through a high-speed chip and battery optimization, providing a smooth user experience that supports advanced features. The drop resistance has been improved, firmly protecting the device from scratches and scuffs. With splash and dust resistance, you can feel secure even if you spill a drink, supporting your active daily life. 【Features】 ■ Equipped with a super-fast processor ■ Long-lasting operation with a large-capacity battery ■ Supports high-speed communication ■ High-performance camera vividly captures memories ■ Advanced technology condensed into a compact body *For more details, please download the PDF or feel free to contact us.

We would like to introduce the "iPad 9th Generation for Corporations" that we handle. Equipped with the A13 BIONIC chip, it offers high processing power and graphic performance, along with a battery life that lasts all day. Additionally, the display features a vivid 10.2-inch screen, providing an ideal visual experience for drawing beautiful illustrations, focusing on work, enjoying movies, or any other purpose. 【Features】 ■ A13 BIONIC chip ■ 256GB large storage capacity ■ Wide-angle camera with center frame support ■ Enjoy handwriting and typing freely ■ Expands new experiences wirelessly *For more details, please download the PDF or feel free to contact us.

The "GRATINA" is a standard mobile phone that can be used for a long time in business. When a call ends, the content of the previous call is saved as voice data. You can listen to it again later. Additionally, when changing models, you can transfer the recorded and saved voice data from this product to a new device using a microSD memory card (sold separately). 【Features】 ■ Save and output important call records ■ Various functions to ensure you don't miss incoming calls ■ Clear audio quality ■ Durable for long-term use ■ Security measures with a model that has no camera *For more details, please download the PDF or feel free to contact us.

The "Speed Wi-Fi 5G X01" is a Wi-Fi router that supports a hybrid network of 4G and 5G, compatible with both "Sub6" and "millimeter wave" frequencies in the 5G spectrum. It has a built-in 2.5GBASE-T wired LAN port, eliminating the need for a cradle. You can utilize high-speed communication in various locations and situations. Additionally, by connecting a business camera to the X01 with a single LAN cable, you can reliably stream 4K video. This ensures that video and audio are delivered to viewers without interruption. 【Features】 ■ 5G-compatible Wi-Fi router ■ Built-in multi-gigabit wired LAN port for experiencing high-speed communication ■ Utilizes Wi-Fi 6 and USB 3.0 (Type-C) to enable various connection methods for 5G *For more details, please download the PDF or feel free to contact us.