Measuring blood pressure with a cell phone is inaccurate and cannot be used as a basis for diagnosis and guidance on medication. Cell phone blood pressure measurement is mainly through the end of the finger pressure, to detect the value of blood pressure. This way of measuring blood pressure is prone to certain errors, and a lot of high blood pressure will be underestimated, while low blood pressure will be overestimated. The currently recommended, more accurate method of monitoring blood pressure is with a mercury column sphygmomanometer, followed by an electronic sphygmomanometer. Among the electronic sphygmomanometers, this type of electronic sphygmomanometer, which measures above the elbow, is relatively more accurate. The classic method of measuring blood pressure is to use a cuff to hoop the brachial artery at the proximal end of the elbow joint, pressurize it and then gradually reduce the pressure, synchronize it with a mercury mercury column to assess the pressure change, systolic blood pressure when the pressure starts to fluctuate, and diastolic blood pressure when the pressure stops fluctuating. However, mercury column measurement is not convenient for home use, so electronic blood pressure monitors are now also used instead. Although there is a slight difference in each measurement, it is better in that it is easier to use and easier to carry and record. It is recommended that if abnormalities are found when measuring blood pressure with a cell phone, professional measurements should be taken at a hospital to obtain accurate blood pressure values and accurately assess or diagnose the disease.