A phone that won't charge is usually one of four things: the cable, the charger, the port, or the battery. Working through them in order saves you from replacing parts you didn't need to.
Swap the cable
Charging cables wear out from bending and coiling, especially near the connector. Try a different cable you know works — this alone fixes a surprising number of charging complaints.
Try a different power source
A wall outlet, a different USB port, or a different charging brick can rule out a failing charger. Low-power USB ports (like some on laptops) may not deliver enough current to charge at all.
Inspect the charging port
Pocket lint builds up in charging ports over time and can physically block the connector from making contact. Use a flashlight to check, and gently clean it out with a soft, non-metallic tool if needed — avoid anything sharp that could damage the pins inside.
Watch for a loose connection
If the phone only charges when you hold the cable at a specific angle, that usually points to a worn-out charging port rather than a cable issue.
Check for a software charging limit
Some phones cap charging speed or pause charging when the battery is very hot or very cold. Let the phone return to room temperature and try again before assuming it's hardware.
If you've ruled out the cable, charger, and visible debris and it still won't charge — or only charges intermittently — the charging port or battery itself likely needs to be replaced.
Still having trouble?
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