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Seventh, eight final assembly number ?(FAC, Final Assembly) Code refers to the phone to complete the production in which a? factory ?(ie, origin), each plant has its special code: IMEI certification model Certification Center 2003 redistribution of the IMEI, the phone number string 7,8 bit FAC yards and six before the TAC code combined digital reunification of the FAC code 00, so no matter what model of what brand of its seven 8 of 00, can not be used above the origin code to control use. 9th to 14th is the production serial number (Serial Number). The serial number of the same brand of the same type of production can not be the same. it has? cell phone jammer specific to the prison in the market.
If there are two models of the same serial number, then certainly one of them is counterfeit. The numbers at the same time can explain the cell phone has to date produced, usually the greater the value that the model factory time later, if the six figures have to pay careful attention to a newly listed phone?s IMEI, because just listed near Mobile, SNR up to no more than four. Finally, a general standby code (Spare), the original is generally 0, now becomes its number can be done by the factory settings with and can be ignored. Some phones IMEI on its own definition, sometimes the IMEI of 17, its final two is used to identify the software version.?? cell phone jammers enhances safety of oil field and oil depot.
The vast majority of GSM mobile phone, simply press the ?* # 06 #?, the IMEI code will be displayed. And affixed in the back of the phone IMEI number IMEI number, IMEI number and the back of the phone IMEI code of the serial number affixed to the same can not ensure that the phone will not be, but if different, the phone must be a problem. IMEI and some other purposes, such as Samsung Samsung park, non-formal channels to enter the mobile phone will not be able to enjoy the service registration; the same for Sony Ericsson mobile phone users, the IMEI can also be on the manufacturers website by IMEI register to enjoy the free download pictures, ring tones, animated screensavers, and even the IMEI will be upgraded as user maintenance based on the records in the Customer Service Centre. The? phone jammer can use omnidirectional antenna of? cell phone jammer .
Domestic operators also use the IMEI IMEI number only to develop the appropriate systems, accurate knowledge of each client held the phone to support the new business. IMEI will play an increasingly important role in future mobile communications. GSM short period of several years of development, GSM900MHz become the dominant standard for the global digital network, the majority of the world?s GSM operators have opted for the 900MHz band. China Mobile, the first GSM network construction is based on a 900MHz digital cellular systems. With the mobile communications is the rapid development of the GSM900 frequency resources are increasingly scarce network capacity limitations become a bottleneck of the development in the mobile phone network. In many cases there will be ?the network is busy, please dial later? prompt and can not connect the call. Different installation ways of?? cellphone jammer can be selected as per different purposes.
In 1992, part of the country launched a personal communications network (PCN) program, which initially called DCS1800 system is very similar to its technology and GSM900, later renamed GSM1800. GSM dual-band network is actually the superposition of two frequency bands of GSM digital mobile communication system network. The biggest advantage of the dual-band mobile phone users aware of the state, between the two networks in the 900MHz and 1800MHz automatically select the best smooth service channel and automatically switch, in order to avoid dropped calls. Even if the signal is weak, the dual-band mobile phone can have better call quality.? cell phone blocker can usually be the first choice of many customers.

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