Any company with growth ambitions must have a formal and well-defined mobile strategy, or it could lose, thanks to this, the promised economic recovery. BYOD (Bring Your Own Device) refers to the fact that members of company ecosystems (management, employees, partners, etc.) will increasingly use their own personal mobile devices (smartphone, tablet etc.) in the future to work from anywhere and anytime. The phenomenon has been for several years now words that define concepts of deploying hyperbolised businesses around the world as essential concepts of the future. An all-new model in companies around the world is CYOD (Choose Your Own Device), where companies allow employees to choose the devices they want to use in the office, which is becoming more and more popular as an alternative to the BYOD phenomenon in the business environment. Following the accommodation of companies and employees with the BYOD program, the emergence of the new CYOD program proves the need and also the efficiency of the transformation and development of BYOD into a new form of use of devices in the workplace. The paper aims to present several security aspects of BYOD technology, with examples for Europe and Romania, and the ever-faster shift to CYOD technology