cell phone measurements of blood pressure are inaccurate. The so-called cell phone measurement of high blood pressure involves covering the rear camera and flash of the cell phone with the fingers of one hand and placing the other finger on the screen. The camera calculates the value of blood pressure by recognizing the fluctuation of the capillaries of the finger where the flash illumination is projected. At present, it is only theoretically possible to measure blood pressure, and the results of this blood pressure measurement, compared with the electronic sphygmomanometer, the error is between ten millimeters of mercury. This error, relatively speaking, is still relatively large, and it is difficult to determine whether the blood pressure of the person being measured is normal through this way of measuring blood pressure by cell phone. At present, the more reliable way to measure blood pressure is still through the vertical mercury sphygmomanometer and calibrated, qualified electronic sphygmomanometer produced by regular manufacturers. If you suspect that your blood pressure is not normal, it is recommended that you seek medical attention, follow the doctor’s instructions for examination, and then follow the doctor’s instructions for treatment.