Observe the phone contact undesirable. Often boot connected to the Internet for a long time. And the screen shows "network failure". After the success of the Internet, in the call, while the signal strength display for full signals become, screen appears "failure" call reminder. Outside the foreign phone cannot connect at this time. In this case, sometimes against the battery back cover or forcibly hold mobile phone, dial operation can be completed. uy2service manual download site
 uy2service manual download site
Sometimes the fault, sometimes don't appear, there is no law. No failure mobile phone everything is normal. The SIM holder or doubt the battery spring contact undesirable, but they will be renovated after still to no avail. Then another occasionally happen: when answering the phone can only hear the sound of the other, each other but couldn't hear his own voice. Through analysis, the microphone signal is according to the socket on the keypad are connected to the main board, it has poor contact? Again and decided to open a cellular phone, remove the keypad, with fine sewing needle tip to the socket all clip to pry the reeds, increase its contact force with motherboard plug. Once installed, the original all the failures, all disappeared.uy2service manual download site