What does GSM, Lock&Unlock mean?

The term GSM means - Global System for Mobile Communications. It is the most popular standard for mobile phones in the world. GSM differs significantly from its predecessors in that both signaling and speech channels are Digital call quality, which means that it is considered a second generation (2G) mobile phone system. GSM is an open standard which is currently developed by the 3rd Generation Partnership Project (3GPP).

How Does it work? GSM phone, in fact, is a fusion of computer and radio stations. Speech is digitized, encrypted with noise-immune and cryptographic algorithms, and in this form is transmitted. Due to the time multiplexing of the channels, 8 telephones can work simultaneously on the same frequency. GSM is the next stage in the development of mobile communications after the NMT standard. NMT is an analog mobile communication standard. In it speech was transmitted in analog form and was not encrypted, i.e. it was very easy to intercept and eavesdrop on this phone.

Lock&Unlock For example if you go to AT&T and purchase a phone from them then that phone is said to be locked unto the AT&T network and as such it cannot work on another network such as SPRINT or NEXTEL. Thus an unlocked phone is a phone that is bought, that is not locked to any network. And as such it can work on any network. The network it will lock unto will depend on the SIM card you put into the phone. For example if you put a AT&T sim in an unlocked phone then it will work on the AT&T network. In the same way if you put a NEXTEL SIM card in an unlocked phone then it will work on the NEXTEL network. However if the phone is locked to a particular network, like say for example AT&T then changing the SIM card in the phone to another SIM card from another network such as NEXTEL will not work. This is because the phone is locked unto to AT&T network and as such will not work on any other network. Yes, you can use the prepaid SIM card on the phone once the phone is either unlocked or on the same network as the SIM card you are going to put into it. It should work just fine.

function Unfortunatly is isn't possible to have more than one phone on the same line. It is possible to have more to than one phone on the same account, in fact, some providers will allow many many lines on one account. The reason why your unable to do this is that your phone has a ESN (electronic serial number) that assoicated with that line. What this does is allow your network to send the calls to your phone. If there is more then one ESN per line then it will cause problems receiving calls. For example, I had a phone that i wasnt using anymore when i bought a new one, well my old phone was recieving text messages that my new one was supposed to get, but the new one would get all the calls. To resolve the issue that had to erase the programming on the phone.

GSM Kazakhstan" is a mobile operator of GSM 900 standard, which provides services under the brands "Activ" and "Kcell". It was founded on September 30, The shareholders of GSM Kazakhstan are the national telecommunications operator JSC Kazakhtelecom and Finnish-Swedish-Turkish company FinTur.

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