1. Please check whether the data cable is normal. The data cable looks normal on the outside, it may have been broken, check method is to borrow someone else's data cable to see if it can be charged;
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2, the display plug symbol is normally full to display, now full or insufficient power, but it can be displayed, indicating that the phone tail plug is no problem, first change a charger to try, if it is still not good, the battery is broken;
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3, again, check whether the original charger can work properly. You can plug the charger into another phone to see if it works properly. Although not all chargers are suitable for iPhone, iPhone chargers are compatible with all USB phones;