Sometimes the users of SD phone will get in the trouble that the phone cannot read the card even after a few times plugging.
Check the following situations to see what the problem is: (1) SD chip is dirty. Because of the careless protect for chips, sometimes there will be dust or dirt. Discrimination; check that if the metal area is black or there is any spot on it. Handling: use cotton with alcohol or water to wipe it gently. Plug it in when it gets dry. (2) Battery voltage. Some good-qualified card requires stable power supply, and the bought battery is not good enough as original battery, so that may cause the problem. Discrimination: when using the bought battery, if the state of stand by is not good, it may be the problem of battery. Handling: Change the battery. (3) The slot is squeezed. The design of slot is very delicate of some ultrathin devices. If the thickness of battery exceeds certain requirement the slot will be squeezed. Discrimination; Change the battery to the original battery. Handling: Use the original battery. Use something to reshape the slot. (4) The wires inside of the slot ...