HTC Desire A8181 - Specifications

Brand name of the company that manufactures the device.

Model name of the device.

Аlternative names, under which the model is known.

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.

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.

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.

UMTS stands for Universal Mobile Telecommunications System. Based on the GSM standard, it is deemed as a 3G mobile network standard. It has been developed by the 3GPP and its major advantage is the provision of greater bandwidth and spectral efficiency, due to the W-CDMA technology.

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.

The frequency is the clock rate of the graphic processor (GPU), which is measured in Megahertz (MHz) or Gigahertz (GHz).

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 type of RAM used by the device.

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.

ROM is a type of permanent data storage, from which data can only by read and not edited. In some mobile devices this is the internal memory, which stores the OS. ROM is used mainly to store non-volatile data and program code, which is saved even if the power is off.

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.

Capacity of the memory card offered together with the device.

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.

Sensors vary in type and purpose. They increase the overall functionality of the device, in which they are integrated.

The rear cameras of mobile devices use mainly a LED flash. It may arrive in a single, dual- or multi-light setup and in different arrangements.

One of the main characteristics of the cameras is their image resolution. It states the number of pixels on the horizontal and vertical dimensions of the image, which can also be shown in megapixels that indicate the approximate number of pixels in millions.

Information about the maximum resolution at which the rear camera can shoot videos.

Information about the maximum number of frames per second (fps) supported by the rear camera while recording video at the maximum resolution. Some of the main standard frame rates for recording and playing video are 24 fps, 25 fps, 30 fps, 60 fps.

The loudspeaker is a device, which reproduces various sounds such as ring tones, alarms, music, voice calls, etc. Information about the type of speakers the device uses.

Information whether the device has an FM radio receiver or not.

The tracking/positioning service is provided by various satellite navigation systems, which track the autonomous geo-spatial positioning of the device that supports them. The most common satellite navigation systems are the GPS and the GLONASS. There are also non-satellite technologies for locating mobile devices such as the Enhanced Observed Time Difference, Enhanced 911, GSM Cell ID.

Wi-Fi communication between devices is realized via the IEEE 802.11 standards. Some devices have the possibility to serve as Wi-Fi Hotspots by providing internet access for other nearby devices. Wi-Fi Direct (Wi-Fi P2P) is another useful standard that allows devices to communicate with each other without the need for wireless access point (WAP).

The technology has several versions, which improve the connection speed, range, connectivity and discoverability of the devices. Information about the Bluetooth version of the device.

Bluetooth uses various profiles and protocols related to faster exchange of data, energy saving, better device discoverability, etc. Some of those supported by the device are listed here.

There are several USB connector types: the Standard one, the Mini and Micro connectors, On-The-Go connectors, etc. Type of the USB connector used by the device.

There are several versions of the Universal Serial Bus (USB) standard: USB 1.0 (1996), the USB 2.0 (2000), the USB 3.0 (2008), etc. With each following version the rate of data transfer is increased.

Тhe USB interface in mobile devices may be used for different purposes such as battery charging, using the device as a mass storage, host, etc.

Information whether the device is equipped with a 3.5 mm audio jack.

Information about some of the most widely used connectivity technologies supported by the device.

Information about some of the features and standards supported by the browser of the device.

List of some of the most common audio file formats and codecs supported standardly by the device.

List of some of the most common video file formats and codecs supported standardly by the device.

The capacity of a battery shows the maximum charge, which it can store, measured in mili-Ampere hours.

The battery type is determined by its structure and more specifically, by the chemicals used in it. There are different battery types and some of the most commonly used in mobile devices are the lithium-ion (Li-Ion) and the lithium-ion polymer battery (Li-Polymer).

2G talk time is the time period a battery charge will last, if one is constantly talking on the phone in a 2G cellular network.

2G stand-by time is the longest time a battery charge will last, if the device is not used but is constantly connected to the 2G cellular network.

3G talk time is the time period a battery charge will last, if one is constantly talking on the phone in a 3G cellular network.

3G stand-by time is the longest time a battery charge will last, if the device is not used but is constantly connected to the 3G mobile network.

Information about some additional features of the device's battery.

This SAR rating shows the maximum level of exposure to electromagnetic radiation taken when the device is placed next to the ear. The applicable limit for the US is 1.6 W/kg per 1 g of tissue. In the US the FCC tests and sets the SAR limits for all mobile devices, which are controlled by the CTIA.

The SAR body rating shows the maximum level of exposure to electromagnetic radiation when the device is positioned against the body at the hip. The highest SAR value of mobile devices allowed in the US is set to 1.6 W/kg per 1 g of tissue. It is specified by the FCC and the CTIA follows whether the mobile devices comply with this standard.

Information about other features of the device.