GSM system according to the theory , the phone receives more than three slots ahead of launch (about 18MS) mobile phone system rather than looking to find the phone system , the receiver decided to launch , say, the phone is the first to receive the transmitter , which is the principle of the mobile phone network If the phone is faulty reception , the base station does not receive the channel assignment information , the transmit path can not enter the standby state, the phone number , as long as the receive channel is good, the display will have a signal strength value , regardless of the presence or absence of signal emission . such as: Samsung series Ericsson series of mobile phones .

 

 

    Therefore, in the absence of network services, operators should first determine whether the problem , look at someone else's phone without a signal , and if so, remove the SIM card for a cell phone to try, if the signal , you can determine the problem lies in the phone , the tone menu , use the manual search methods to find the network , if the search to " China mobile" or " China Unicom " , the receiving part of the normal , while the transmitter circuit failure , if "No network Service " describes the receiving channel has failure at this time , if your antenna without exception , you can take the maintenance department to explain the situation and let him repair it. does not enter the mobile phone network is the communication network is one of the common fault of the phone. when network operators, mobile phone hardware ( RF circuits, logic / audio circuitry ) when a software problem, can cause such failures . networks do not have a signal can not be divided into network and non- network signals are not two cases.

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