My phone won't charge.

One of the most common problems is metallic surfaces inside the USB port and the USB charger aren't making clear contact. The reasons could be from manufacturing defects or continuously plugging and unplugging the charging cable.

All you need is to shut down your phone take out the battery, use something small (ex: toothpick) to lever up the tab inside the USB port of your smartphone. do these steps very carefully and slowly then reinsert your battery and plug it in again. Most likely this was the cause.