it may be because your charging port is filled

with too much debris.

Here are the steps you should take to properly clean

your phone's charging port.

First, power off your iPhone completely.

You should get a flashlight

or work under a bright LED lamp.

You can clean it with compressed air first,

and if this doesn't work,

you can use a wooden toothpick.

Never insert anything harder than the wooden toothpick

in the iPhone's lightening port.

This is so you don't damage the delicate electronics

within the port.

Let's start first with using compressed air.

Holding the compressed air can upright

so it doesn't expel wet propellant,

shoot a few short, controlled bursts of air into the port,

then try to charge it again.

If it's still not working, move on to trying the toothpick.

Gently insert the toothpick into the port

and lightly scrape it against the inside wall of the port.

After using the toothpick for a while,

give the port another burst of compressed air

to help remove anything you've loosened,

then try to charge it again.

Hopefully, after a few cycles of cleaning,

your phone will start to charge.

If not, take it to an Apple service center

for professional help.