What is the GSM phone?

GSM Phone is a type of mobile phone that uses a global mobile communication system to send and receive telephone calls. This is one of the two main standards for mobile communication in the world, with the other code division more access (CDMA). In general, the GSM phone is likely to be a good choice for someone who travels outside the US, often changes carriers, lives in a country area, or has to transfer a lot of information about demanding data.

advantages and disadvantages

One of the advantages of the GSM phone is the ease with which users can change carriers or headphones. This is due to the Subscriber Identification Module (SIM), which is a removable intelligent card that transmits user contacts, calendar information and personal identification information. The user can move it between mobile phones and still accept voice calls to the same number and prevent users from needing to re -enter personal information every time they buy anni tElefon. In addition, if a person changes mobile services, then he can insert a new SIM card into the old phone.

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GSM phones also tend to have clearer signals when calling inside and can use cellular repetitions that increase and rebroadcast require better signal strength. They also use less energy and can therefore be used longer than charging. Disadvantages include GSM signals tend to interfere with some electronic devices such as radios and speakers, although this usually occurs only for 2G phones. In addition, many of the US carriers use CDMA, so it is often difficult to use the GSM phone in the US.

gsm vs. CDMA

GSM and CDMA differ primarily in terms of where they are used, the type of intelligent card they contain and roaming. There are also differences in the PRE-4G phones in terms of data transfer speeds. GSM is used on most of the location, except North AmericaY and some parts of Asia where CDMA is more frequent. Although both contain a universal integrated circuit card (UICC), GSM phones use the SIM card, while CDMA phones have a CDMA2000 subscriber card (CSIM). Although there are some UICC cards that are designed to work with both GSM phones and CDMA, SIM cards and CSIM cards are not interchangeable.

both work quite well in urban areas, but GSM tends to be better for both domestic and international roaming, because GSM carriers are more common around the world and conclude a contract with other carriers to allow users to use their network when they are in the area. In 3G phones, GSM can also have faster data transfer speed, although it is not a 4G phones problem, because both IT and CDMA work with the main standards of 4G.

technical details

GSM phones use technology called Time Division Multiple Access (TDMA) to transfer calls. This distributes the transmission time to the singing communal toAnal to segments called framework, each of which is then divided into eight time slots. These slots are assigned to different users whose phones are transmitted during their name slot in quick succession, many times every second. This allows multiple people to use the same channel at the same time, although the disadvantage has the overall total range of the bandwidth to the communication channel due to technical challenges to keep the channel sharing phones correctly synchronized.