The car mobile phone holder is to facilitate the driver to place the mobile phone in an appropriate position while driving, and it is convenient to take it down or operate it directly. Convenience and safety are the basic requirements. There are mainly the following fixing methods for car mobile phone brackets: 1. Dashboard suction cup type. As the first-generation mobile phone holder, the disadvantage is that the suction cup is not strong, and the mobile phone is easy to fall; the second-generation instrument panel suction cup type, adding glue filling process, can wash the glue, effectively solve the problem that the suction cup of the first generation suction cup type mobile phone holder is not strong on the instrument panel. Defects: The advantage of the instrument panel suction cup type is that the instrument panel position is optional and placed in the most comfortable position. 2. Front block suction cup type. Installed on the front windshield, the disadvantage is that it is far away, the hand operation is inconvenient, and the installation position has the suspicion of blocking the line of sight; the advantage is that the suction is firm, there will be no doubt about hurting the car, and it is more assured; looking at the navigation can almost look up, and the navigation More convenient; 3. Air outlet type (hook, clip air leaf). It is installed at the air outlet of the air conditioner. The disadvantage is that due to different models, the fixed structure and position are limited, and the angle cannot be rotated and adjusted; the advantage is that it is easy to operate from a short distance; It can be installed in any flat position that is convenient for the driver to operate. The disadvantage is that the adjustment angle of the mobile phone is limited, and there will be marks when it is pasted and removed. The advantage is that it is small and does not block the line of sight. 5. Silicone or other non-slip brackets, the disadvantage is that the direction cannot be adjusted, and the mobile phone is not firmly fixed. The advantage is that it is easy to fix and remove the mobile phone.