Can the secret of nano-phone coating scam really not be uncovered?

I joined, and it is also the Spark Science and Technology Building. I bought a machine. Anti-fall is fake and has no anti-fall effect. Therefore, the mobile phone still needs to be pasted with a toughened film, which has a general waterproof effect and can play a certain role. However, there will be a series of problems in the later stage of the mobile phone that has entered the water. If this thing is done, the risk value in the later period is very high. Please consider it carefully.