If your iPhone is not charging when you plug it into a wall charger or into you computer's usb port, this is a usb connectivity issue and the connection just needs to be reset. All that needs to be done is plug the iPhone's cable into the phone but don't plug into the computer yet. Hold the phone's select button (the round button with the square) down for about 30 seconds or until the apple appears on the screen. your phone will reload and reset the connection and the computer should recognize the device. Allow the phone to charge for at least 30 minutes before unplugging.
The easiest way to charge an iPhone is to plug it into the USB port of a computer or some wall chargers may not supply exactly +5v which the iphone requires. because the iPhone doesn't charge like other normal USB devices. Just by supplying 5 volts to the USB cable of the iPhone will not charge it. That's why most wall chargers will not work with the iPhone.
I hate it when a phone charging cord isn't reliable! However, far too many perfectly good iPhone (mobile phone) charging cords are thrown away, under the (often false) assumption that they are broken, when in fact, the cord contacts are most likely just impaired from oxidation on the cord contacts. Scraping the contacts can sometimes help, but it can also permanently damage the contacts. So, I discovered this solution when I used this same method to fix the connection to my Apple Thunderbolt display (I posted a response on that as well), and discovered that using the liquid called DeoxIT (available on Amazon), almost all connections issues are easily resolved (not including cords which are actually broken). Just apply a drop of the DeoxIT on the Apple Lightning plug, then insert and remove the plug from the phone repeatedly, to work the liquid over the internal contacts. Then apply a drop or two of the DeoxIT to the USB end of the charging cord (first make sure the charging plug base is not plugged in to power, to avoid electrical shock). Insert and remove the USB plug from the cord into the plug brick/base repeatedly to remove the oxidation. I do this on all of my USB phone, computer, entertainment (including HDMI) devices and it seems to keep the signal strong, and keeps the phones charging properly.
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