The most common reason your iPhone won't charge is a blocked charging port or a damaged cable
When your iPhone stops charging, the problem is usually one of three things: the port where the cable connects is clogged with lint or debris, the cable itself has a break in it, or the battery has failed. Most of the time it is the port or cable — both are fixable without a trip to Apple. Start by checking the port first, because that takes 30 seconds and rules out the simplest culprit.
Plug your iPhone into power and look at the charging port on the bottom of the phone. Use a flashlight and look straight into it. If you see lint, dust, or any debris packed inside, that is blocking the connection. Do not use a metal object — a paperclip or needle will scratch the contacts inside and make things worse. Instead, use a wooden toothpick or a plastic dental pick, and gently scrape the sides and bottom of the port while the phone is powered off. Work slowly and let gravity pull the debris out.
If the port is clean, the problem is almost certainly the cable. Look at the cable where it enters the connector — this is where cables break most often, usually from bending or being stepped on. If you see any cracks, exposed wires, or discoloration, the cable is damaged and needs to be replaced. Even small damage inside the cable can prevent charging.
Key Takeaways
- Check your charging port with a flashlight first — lint and debris are the most common reason iPhones won't charge, and a wooden toothpick can clear it safely.
- Inspect your cable where it connects to the phone, because cables break at that point from bending and cannot be repaired.
- If the port is clean and the cable looks intact, try a different cable and power adapter to rule out a problem with those parts.
- If nothing works, the battery itself may have failed, which requires a replacement from Apple or an authorized repair shop.
How to test whether the cable or power adapter is the problem
Before you assume your iPhone battery is dead, test with a different cable and power adapter. Borrow a cable from a friend or family member, or buy an inexpensive replacement — Apple's official cables cost more, but third-party cables that say "MFi certified" work just as well and are cheaper. Plug the borrowed cable into a different power adapter if you can, or into a different outlet in your house.
If your iPhone charges with the borrowed cable and adapter, your original cable or adapter is the problem — replace whichever one you swapped out. If it still will not charge, move to the next step. Do not spend money on multiple cables before you know which part is broken.
One more test: if you have access to a computer, plug your iPhone into the USB port on the back of a desktop or laptop. Computers charge iPhones more slowly than wall adapters, but they will charge if the phone and cable are both working. If the computer charges your phone but the wall adapter does not, the adapter is faulty.
What to do if the port is clean and the cable works
If you have cleaned the port, tested with a working cable and adapter, and your iPhone still will not charge, the battery itself may have failed. Lithium batteries degrade over time — after two or three years of daily use, they lose the ability to hold a charge and eventually stop accepting power altogether. This is not something you can fix at home.
Before you go to Apple, try one more thing: force restart your iPhone. Sometimes a software glitch prevents charging even though the hardware is fine. Press and quickly release the volume up button, then press and quickly release the volume down button, then press and hold the side button until you see the power-off slider. Let go and wait for the phone to restart. After it boots back up, plug it in and wait five minutes to see if charging begins.
If the force restart does not work, you will need to visit an Apple Store or an authorized repair shop. Bring your phone, your cable, and your power adapter so they can test all three together. Apple can run a diagnostic that tells you whether the battery has failed or whether something else inside the phone is preventing charging. Battery replacement usually takes a few hours and costs between $50 and $100 depending on your iPhone model.
How to avoid charging problems in the future
Most charging failures come from wear and tear on the cable. The connector end flexes every time you plug in and unplug, and the cable itself bends when you wrap it up. To make your cable last longer, do not wrap it tightly around your phone or charger — coil it loosely or use a cable organizer. Avoid bending the connector end sharply, and do not let the cable get pinched under furniture or stepped on.
Keep your charging port clean by checking it every few months. Lint accumulates slowly, and catching it early prevents the port from becoming completely blocked. If you use your phone in dusty environments — a workshop, a construction site, or a very sandy beach — check the port more often.
Use a power adapter that came with your iPhone or one that is MFi certified. Cheap third-party adapters can damage your battery over time or stop working suddenly. The few dollars you save on a knockoff adapter is not worth replacing your battery early.
Why your iPhone might charge slowly instead of not at all
If your iPhone is charging but taking much longer than usual, the problem is usually the power adapter, not the phone. iPhones come with different adapters depending on the model — newer phones come with 20-watt or higher adapters, while older models come with 5-watt adapters. If you use a 5-watt adapter on a newer iPhone, it will charge very slowly.
Check the wattage printed on your power adapter. If it says 5W and you have a newer iPhone, you can buy a faster adapter — 20W or higher — and charging will be noticeably quicker. You can also charge through a computer USB port, but expect it to take several hours.
Slow charging can also mean your battery is degrading. As batteries age, they accept power more slowly. If your iPhone is more than three years old and has been charged daily, slow charging is normal and does not mean anything is broken — it just means the battery is wearing out naturally.
When to replace your cable versus when to get professional help
If your cable is visibly damaged, replace it. This is a $15 to $30 fix that you can do yourself. If your port is clogged, clean it. If neither of those works and you have tested with a working cable and adapter, the problem is inside your phone — either the battery or the charging circuit — and you need professional help.
Do not try to open your iPhone yourself. The battery is glued in, the screws are tiny and proprietary, and you can easily damage the screen or other components. An Apple Store or authorized repair shop has the right tools and can diagnose the exact problem in minutes. If your phone is still under warranty or covered by AppleCare, the repair may be free or discounted.
Frequently Asked Questions
Can I charge my iPhone with any USB cable?
Any cable with the right connector — Lightning for older iPhones, USB-C for iPhone 15 and newer — will charge your phone. Third-party cables work fine as long as they are MFi certified, which means Apple has tested them. Avoid very cheap cables from unknown brands, because they may not work reliably or could damage your battery.
Why does my iPhone only charge when the cable is bent a certain way?
The cable is broken inside, even if it looks fine on the outside. The wires inside have separated or cracked, and bending it a certain way makes the connection work temporarily. This will get worse over time. Replace the cable now rather than waiting for it to stop working completely.
Does using my phone while it charges slow down the charging?
Yes, using your phone while charging makes it charge more slowly because the battery is powering the screen and processor at the same time it is receiving power. If you need your phone charged quickly, turn it off or put it in airplane mode while it charges. Charging will be noticeably faster.
Is it bad to leave my iPhone plugged in overnight?
Modern iPhones stop charging once the battery reaches 100 percent, so leaving it plugged in overnight will not overcharge it or damage the battery. However, keeping the battery at 100 percent constantly does cause it to degrade slightly faster over years of use. If you charge overnight regularly, your battery may wear out a few months sooner than it would otherwise.
What does the lightning bolt symbol mean when my iPhone is plugged in?
The lightning bolt means your phone is receiving power and the battery is charging. If you see the lightning bolt but the battery percentage is not increasing after several minutes, the charging port or cable may be partially blocked. Unplug, clean the port, and try again.