Sim card installation is likely to cause the mobile phone short circuit burning motherboard, to my maintenance experience has touched a lot of sim installation caused can not open the machine, because the card chip is also a line, and the motherboard card six contacts right or wrong position line cross, install the battery will cause the burning machine! Don't put it wrong!
There is no harm to the phone on the card, there may be a fixed mechanism inside the phone, the card reading needle will also cause scratches on the card surface, and because the shape does not match, it is easy to lead to the deformation of the internal parts, and the next time you insert it may have some position deviation and so on.