UMi Rome X | Black | 4GB | Refurbished | Grade New

Brand name of the company that manufactures the device.

Model name of the device.

Information about the width, i.e. the horizontal side of the device when it is used in its standard orientation.

Information about the height, i.e. the vertical side of the device when it is used in its standard orientation.

Information about the thickness/depth of the device in different measurement units.

Information about the weight of the device in different measurement units.

Estimated volume of the device, calculated from the dimensions provided by the manufacturer. Applies for devices in the form of a rectangular parallelepiped.

Information about the colors, in which the device is available in the market.

Materials used in the fabrication of the device's body.

Information about the type and size (form factor) of the SIM card used in the device.

Information about the number of SIM cards, supported by the device.

Information about some specific features related to the SIM card(s) of the device.

GSM (Global System for Mobile Communications) was developed to replace the analog cellular network (1G), therefore it is referred to as a 2G mobile network. It has been improved with the addition of General Packet Radio Services (GPRS) and later via the Enhanced Data rates for GSM Evolution (EDGE) technology.

W-CDMA (Wideband Code Division Multiple Access) is an air interface used by 3G mobile networks. It is one of the three different UMTS interfaces together with the TD-SCDMA and the TD-CDMA. The standard provides faster data transfer speeds and allows more users to connect to the network simultaneously.

There are several network technologies that enhance the performance of mobile networks mainly by increased data bandwidth. Information about the communication technologies supported by the device and their respective uplink and downlink bandwidth.

Information about the operating system used by the device as well as its version.

The SoC integrates different hardware components such as the CPU, GPU, memory, peripherals, interfaces, etc., as well as software for their functioning.

Information about the process technology used in manufacturing the chip. The value in nanometers represents half the distance between elements that make up the CPU.

CPU is the Central Processing Unit or the processor of a mobile device. Its main function is to interpret and execute instructions contained in software applications.

The CPU bits are determined by the bit-size of the processor registers, address buses and data buses. 64-bit CPUs provide better performance than 32-bit ones, which on their part perform better than 16-bit processors.

The instruction set architecture (ISA) is a set of commands used by the software to manage the CPU's work. Information about the set of instructions the processor can execute.

The cache memory is used by the processor in order to shorten the time needed to access data and instructions that a frequently used. The L1 (level 1) cache memory has a small volume, but operates faster than the RAM and the rest cache memory levels. If the processor does not find the data needed in L1, it continues to look for it in the L2 cache memory. In some processors the search in L1 and L2 is simultaneous.

The L2 (level 2) cache memory is slower than L1, but has a larger capacity, instead, which allows it to cache more data. Just like L1, it is much faster than the system memory (RAM). If the CPU does not find the data needed in L2, it proceeds to look for them in the L3 cache memory (if there is such) or in the RAM.

A CPU core is the processor unit, which executes software instructions. Presently, besides single-core processors, there are dual-core, quad-core, hexa-core and so on multi-core processors. They increase the performance of the device allowing the execution of multiple instructions in parallel.

The frequency of the processor describes its clock rate in cycles per second. It is measured in Megahertz (MHz) or Gigahertz (GHz).

GPU is a graphical processing unit, which handles computation for 2D/3D graphics applications. In mobile devices GPU is usually utilized by games, UI, video playback, etc. GPU can also perform computation in applications traditionally handled by the CPU.

Similar to the CPU, the GPU consists of processing units called cores. They handle the computation of graphics in various applications.

RAM (Random-Access Memory) is used by the operating system and all installed applications. Data in the RAM is lost after the device is turned off or restarted.

Information about the number of RAM channels integrated in the SoC. More channels mean higher data transfer rates.

RAM frequency relates directly to the rate of reading/writing from/in the RAM memory.

Information about the capacity of the built-in storage of the device. Sometimes one and the same model may is offered in variants with different internal storage capacity.

The various types of memory cards are characterized by different sizes and capacity. Information about the supported types of memory cards.

One of the main characteristics of the display is its type/technology, on which depends its performance.

In mobile devices display size is represented by the length of its diagonal measured in inches.

Approximate width of the display

Approximate height of the display

The ratio between the long and the short side of the display

The display resolution shows the number of pixels on the horizontal and vertical side of the screen. The higher the resolution is, the greater the detail of the displayed content.

Information about the number of pixels per centimeter (ppcm) or per inch (ppi) of the display. The higher the pixel density, the more detailed and clearer is the information displayed on the screen.

The color depth of the display is also known as bit depth. It shows the number of bits used for the color components of one pixel. Information about the maximum number of colors the screen can display.

The estimated percentage of the screen area from the device's front area.

Information about other functions and features of the display.