In 2026, several high-end 5G smartphones were evaluated for their potential in business-to-business (B2B) environments. The models tested included the Samsung Galaxy S26 Ultra, Apple iPhone 17 Pro Max, Oppo Find X9 Ultra, Samsung Galaxy S25 Ultra, and Samsung Galaxy S25+. These devices were assessed based on factors such as battery life, security features, connectivity options, and total cost of ownership (TCO), which includes all expenses over the product’s lifespan. The Samsung Galaxy S26 Ultra stood out with features like a privacy filter that can be activated to prevent visual hacking. It offers more than 26 hours of battery life in mixed use and can be fully charged in 48 minutes using a 60 W wired charger. The phone includes a Privacy Display that limits viewing angles, eSIM compatibility, and a 7-year software support plan. It also uses Armor Aluminum 2 for better thermal management. However, it lacks Qi2 wireless charging and has a high initial cost, starting at 1,469 € HT. The Apple iPhone 17 Pro Max provides over 29 hours of battery life, a 12 GB RAM, and the A19 Pro chip for smooth performance. It features a 6.9-inch OLED display with a peak brightness of 2930 cd/m², Face ID for secure authentication, and Apple Business Manager for easy deployment in corporate settings. The device also supports USB-C connectivity and offers up to 2 To of storage. However, it takes 1 hour and 20 minutes to fully charge and has a relatively heavy design at 233 g, which may impact comfort during extended use. The Oppo Find X9 Ultra uses a 7050 mAh silicon-carbon battery and a dual 200 Mpx optical sensor for high-precision visual tasks. It is powered by the Snapdragon 8 Elite Gen 5 and 12 GB of RAM, providing more than 27 hours of battery life. The phone supports 100W fast charging, allowing a full charge in just 52 minutes. It includes an ultrasonic fingerprint sensor but lacks certified 2D facial recognition. However, its proprietary charging protocol and some pre-installed software may require additional security measures. The device is also relatively thick at 15 mm and weighs 236 g. The Samsung Galaxy S25 Ultra features a titanium body and an AI-tailored chip, offering a 6.9-inch screen with a peak brightness of 2348 cd/m². It provides more than 24 hours of battery life and includes a 7-year software support plan. The phone also has One UI 7 for smooth integration with mobile device management (MDM) systems and the S Pen for precise electronic signatures. However, its 45 W wired charging speed is slower than some competitors, and its larger size may not be ideal for all users. The Samsung Galaxy S25+ is a more compact and affordable option compared to the S25 Ultra, with a 6.7-inch AMOLED screen, 25 hours of battery life, and a 7-year update commitment. It includes Knox security, Wi-Fi 7 connectivity, and AI features like native audio transcription. Despite these benefits, it also has a 45 W wired charging limit and a telephoto x3 lens that may struggle in low-light conditions. Each of the tested models offers distinct advantages and drawbacks, depending on the specific needs of professional users. While some prioritize battery life and security, others focus on performance or connectivity. The choice of device ultimately depends on the particular requirements of the business environment.