**3. Concept of mobile health**

According to WHO, e-health is the use of information and communication technologies (ICTs) to support health and health -related fields, including health care services, health surveillance, health literature and health education, knowledge and research [23].

In common parlance, e-health encompasses everything that is associated with the digitalization of health.

The adoption of IT tools in the field of health (e-health) has evolved throughout successive historic periods from medical records and professional messaging to telemedicine, online communities, mobile applications and connected objects, augmented reality and virtual reality, artificial intelligence and chat bots and, finally, the block chain technology [24].

Mobile health or m-health is a major component of connected health (e-health). Mobile health is defined as medical and public health practices that rely on mobile devices such as mobile phones, patient monitoring systems, personal digital assistants and other wireless devices [25].

This involves the integration of connected objects and mobile applications into the practice of medicine and the health system.

This concept has emerged from the exponential development of digital technologies in general and mobile wireless technologies in particular. Nowadays, these technologies are increasingly part of the daily life of both health professionals as well as patients. On the other hand, the world's health system is facing immense difficulties, mainly related to the increase in health expenditure and the disparity in access to care. As a result, mobile health has emerged as a promising solution to the current global health challenges.

#### **4. Anatomy of a smartphone**

A Smartphone is made up of many internal parts or components. There are differences between models and brands but the structure remains the same.

This technological jewel has several assets:

