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 VoIP (Voice over Internet Protocol) is simply the voice over IP networks.
The Internet Protocol (IP) was originally designed for networking of data. The success of intellectual property to become a global standard for networking data led to its adaptation to voice networking.
The economics of VoIP
VoIP has become popular mainly because of cost benefits to consumers through traditional networks telepone. Most Americans pay a flat monthly fee for local calls and per minute for long-distance calls.
Calls can be placed through the Internet. Most Internet connections are charged using a flat monthly fee structure.
Using the Internet connection for both data traffic and voice calls can allow consumers to get rid of a monthly payment. In addition, VoIP plans do not charge per minute for long distance charges.
For international calls, the savings for consumers to switch to VoIP technology can be enormous.
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 Code division multiple access (CDMA) is a channel access method utilized by various radio communication technologies. It should not be confused with the mobile phone standards called cdmaOne and CDMA2000 (which are often referred to as simply "CDMA"), this uses CDMA as an underlying channel access method.
One of the basic concepts in data communication is the idea of allowing several transmitters to send information simultaneously over a single communication channel. This allows several users to share a bandwidth of frequencies. This concept is called multiplexing. CDMA employs spread-spectrum technology and a special coding scheme (where each transmitter is assigned a code) to allow multiple users to be multiplexed over the same physical channel
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 A smartphone is a small, all-in-one devices that is used for communication and computing functions. Unlike the ordinary cellular phones, smart phones allow users to choose the applications they want to install and use. This means that users can customize the range of applications in smartphones based on their lifestyle and their work.
Ordinary cell phones to limit the applications that the user can use for applications that come with the phone. With smartphones, users can choose their own calendar, phone book, organizer, etc. In this regard, a smartphone is a cell phone with features or PDAs PDA with the communication skills.
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Mobile Telephone Switching Office
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Science
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 Mobile Telephone Switching Office (MTSO), a computer or a switch, is the brains of a cellular system. The MTSO assigns frequencies to each call, reassigns frequencies for hand-offs, interconnects calls with the local and long distance landline telephone companies, compiles billing information, etc. Every cellular system has one or more MTSOs or switches.
MTSO stands for Mobile Telephone Switching Office. The MTSO is the passage that connects all the offices of the individual cell towers to the Central Office (CO).The MTSO is responsible for monitoring the relative signal strength of your cell phone as indicated by each of the cell towers, the conversation and the commutation of the cell tower to get the best reception.
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What is cloning a cell phone?
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 Cell phone cloning is copying the identity of a mobile phone to another mobile phone.
Usually this is done in order to make fraudulent calls. The bill to make it to the legitimate demand subscriber. Hence, cloning very popular in areas with large immigrant population, where the cost of "home" is very steep. The clone is also able to effectively anonymous calls, which attracts another group of interested users.
Motorola Cellular began with cloning "bag" phones and reached its peak in the mid-90s, with a change for the Motorola "brick" phone, as the Classic, the Ultra Classic, and the model 8000.
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What PCS (Personal Communications Service)
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 PCS (Personal Communications Service) is a set of standards. PCS is a new generation of wireless-phone technology that introduces a range of features and services surpassing those available in analog and digital-cellular-phone systems. PCS provides the user with an all-in-one wireless phone, paging, messaging, and data service having a greatly improved battery-standby time. Most PC standards are based on an existing standard. PCS is a bit over the operation of these standards on the frequency bands 1930-1990MHz for receiving and 1850-1910Mhz for transmission.
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 High-Speed Downlink Packet Access (HSDPA) is also known as High-Speed Downlink Protocol Access. HSDPA is a protocol for mobile telephony. This is a third generation (3G) High-Speed Packet Access technology to speed up network capacity and data cellular telephones.
HSDPA is associated with various Universal Mobile Telecommunications System (UMTS) networks. This is the Global System for Mobile (GSM) Communications.
Currently, HSDPA can support speeds up to 1.8 Mbps to 14.4 Mbps. If this is not very fast compared to wireline networks, it is an important milestone on the speed available to cellular technology
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