Often, we can fix these failures and interruptions by installing software update or re-installing the entire operating system. For such repairs, we use software tools recommended by the mobile phone manufacturer or recommended by the independent manufacturers within which these devices are supported. With software updates, it is sometimes necessary to backup user data if this operation is not affected by the malfunction of the device itself. With software updates and data backup, it is also desirable to perform both calibration and fine tuning of all device parameters.

In contrast to software servicing in hardware interventions on the device, it is necessary to disassemble the device and to approach the repair of the failure by replacing a certain assembly or part that is defective.

Over the last 20-30 years we witnessed incredible shifts in the development and design of mobile phones. Sometimes these devices were robust and simple design with modest technical characteristics. Today's mobile phones have experienced significant innovation features and have experienced a true evolution in design as well as complexity and operability. Also, failures on devices as well as their removal have undergone a real revolution. In today's mobile phones, the most common faults are related to damage to the display as well as other parts of the case. There have also been disruptions related to charging as well as malfunction of the battery. With the development of mobile design the phone switches both the access and the mode of servicing as well as the necessary tool for successful removing of failures. Modular approach in making and assembling the phone helps us to easily repair the defective part of the device by removing a certain assembly or module of the phone in a short time and with an affordable price. Designing contemporary mobile devices the main word is that of designers who are trying to make the new device perfect and have compact design, to make the device highly waterproof and dustproof and to integrate all the elements without clear transitions into a single whole. In order to access the service of a modern mobile phone, is that we have a set of necessary tools as well as necessary knowledge for procedures and methods of disassembly and assembly of devices. In most of the newest mobile phones, the largest surface of the device is covered by the display module. For this reason, this phone set is mostly exposed to damage and malfunctions due to falls and mechanical impacts. Plastic and rubber on the older devices is replaced with glass and aluminum, and due to the sensitivity to the falls, more frequent damage to these circuits has taken place. Major changes have been made in the device's connection systems and most of today's phones have a micro USB or lightening connector instead of robust connectors that were once used. This novelty in design and size is ascending detected frequent faults on charging connectors and problems associated with connection of the device.

The emergence of powerful camera modules on mobile phones has attracted many users to use their devices for making great photos as well as videos. There was also a set of failures and problems related to the operation of these circuits as well as the quality of those recordings.

Numerous sensors are present in mobile phones and frequent falls as well as inadequate handling can cause some problems and anomalies in the operation of your devices. The set of sensors is located on the base of the phone, and because of high integration and very small area, the whole assembly of the base plate is most often changed. Older devices often changed the defective elements on the base board, whereas modern mobile phones usually change the entire assembly of the base board due to the size and degree of integration.

The battery for the power supply of the mobile phone has also undergone significant changes in design and quality as well as the storage capacity of the power. Most of the batteries are integrated in the device itself and are not exchangeable by the users, but it is necessary to partially or completely disassemble the device in a service center with a set of tools and expert knowledge.

Due to the improvement of design and the application of modern technologies in the production of today's mobile phones are much more resistant to the impact of moisture and liquid, so are these failures are less represented than before. On the other hand if the liquid penetrates the inside of the damage device it is usually such that this the device is very hard to repair or can not be brought into the working and functional state at all.

A large number of mobile phone manufacturers are trying to use modern materials in the production of the device that meet design requirements as well as to provide compactness and protection for sensitive circuits in their device with their strength and resistance to external influences. Glass, metal as well as composite materials are the main raw materials dominate the production of mobile phone cases and improve the characteristics of these materials will determine the trend in design and the design of the phone of tomorrow.