it is out of the shielding range of mobile phone jammer

 Otherwise, it is out of the shielding range of mobile phone jammer .
Because of the need for the highest precision and quality control of this complex process, so never put his Nokia cell phone manufacturing outsourced to other manufacturers. (Sometimes will be some of the smaller number of Nokia cell phone production contracted out to other manufacturers, this is mainly present in the older cell phone models, they do not require customization, and does not require fast delivery.) But the opposite is true, Nokia will he manufacturing technology as a key strategic advantage, and in the case of a large number of Nokia can be more than any other world manufacturers produce cell phones more efficiently. Cell phone call before processing systems to read the information. Such as: leading case in recent quarters, which is now the frequency of use and residential communities can use the country code and mobile systems, network number, etc., this information is to be on the BCCH. Cell phone in the request access channel (RACH) request information on the issue of access to the system to send the SIM card account number. After passing the authentication system, by allowing access channel (AGCH) to GSM cell phone access channel and assigned to a separate dedicated control channel GSM cell phone (SDCCH). mobile phone jammer scans at a certain speed during the working process.Pay attention that the antenna of mobile phone jammer can not be installed in the reverse direction
Cell phone to complete the registration on the SDCCH. In Slow Associated Control Channel (SACCH) on the issue control instructions. And then cell phone to idle, and monitor control channel BCCH and CCCH information on the public. At this point do the paging cell phone preparation. Users to monitor BCCH must be made with a similar base station synchronization. By receiving the FCCH, SCH, BCCH information, the user will be locked into the system and appropriate on the BCCH. We consider the GSM system in the case of a call by the cell phone. First, the user in monitoring BCCH must be made with a similar base station synchronization. The cell phone will appear situations of net searching, no-signal, no-service system and so on if mobile phone jammer is used.
By receiving the FCCH, SCH, BCCH information, the user will be locked into the system and appropriate on the BCCH. To place a call, users must first dial, and press the launch button on the GSM cell phone. Locking its cell phone base station system ARFCN to transmit RACH data burst sequence. On CCCH and the base station to the AGC information to respond to, CCCH for the cell phone to specify a new channel for SDCCH connection. BCCH in TS0 is monitoring the user, it received from the AGCH ARFCN and TS arrangements, and immediately go to the new ARFCN and TS, and this new ARFCN and TS distribution is SDCCH (not TCH).