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Ask for free telephone consultation, hello! Common faults of mobile phones and their maintenance methods are as follows: 1. Cause Analysis of Unable to Send Short Message: How to deal with the wrong number of short message center: Open the message, click the virtual menu button, and then click Settings-Short Message Service Center in turn to set the number of short message center to the number of local network operator. (SMS centers vary by operator and region. Please call the local operator for consultation. 2. Cause analysis of touch screen failure: 1. If the touch screen is not sensitive when charging, it will generally be caused by the unstable output voltage of the original charger. 2. Touch screen is insensitive due to screen protective film. 3. Touch screen is insensitive to static electricity. 4. System software reason 5. The mobile phone is ROOT6. 6. Hardware fault solution: 1. Replace the original charger. 2. Tear off the protective film. Check whether it can be solved. 3. Press the switch twice to discharge static electricity. 4. After data backup, restore the factory settings. If the problem still cannot be solved, check whether there is a new OTA version, and you can upgrade to the latest version. 5. Deal with it after delivery. 3. Analysis of the cause of the phone crash: 1, there are too many programs running in the background, which takes up too much running memory. Causing the system to fake death or crash; 2. The virus in the mobile phone; 3. Too much data is stored in the mobile phone or too many programs are installed. Solution: 1 Quit some programs running in the background, and get into the habit of quitting running programs by returning or quitting virtual buttons; 2. Install antivirus software to kill viruses; 3. Delete and uninstall some data and programs that are not commonly used or transfer some programs to the memory card. I hope I can help you!