Turn off the iPhone
Unplug the charging cable
Inspect the charging port with a flashlight
Use a dry, soft, anti-static brush to loosen debris
Gently remove lint with a wooden or plastic toothpick
Tap the iPhone lightly with the port facing down
Use short bursts of compressed air only if needed
Avoid metal tools, liquids, and sharp objects
Recheck the port for remaining debris
Test charging with a clean cable
Seek professional service if the port still does not work