Well, it happens many times that our iPhone doesn’t charge up. We plug it in, again and again, hoping to show some kind of charging signal! but no it doesn’t charge. That’s the time when we start to freak out, different thoughts come to our mind like is it damaged? is it defective? or somebody has done something with it.
So is your iPhone really damaged? Probably not, in fact, there are some really common reasons an iPhone won’t charge, and most of the time it has nothing to do with the iPhone itself (unless it was damaged, but more on that in a moment).
Here Are Some Common Reasons Why iPhone Won’t Charge Up
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Change the Wall Outlet or USB Port Plugged Into:

The next most common reason an iPhone won’t charge is that how and where is it plugged into. It may happen that the wall outlet isn’t working or there may be some kind of problem on the switch board. So you must have a check at those.
If you’re charging the iPhone from a USB cable connected to a computer, sometimes the USB port on the computer itself is the problem. Try another USB port on the computer, PC or Mac doesn’t matter, that often fixes the issue too.
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USB Cable May Be Damaged:

We have got this as an answer to the question ” iPhone not charging ” just because USB cable isn’t working. Damage to the USB charging cable will prevent an iPhone from charging. This can be somewhat obvious in some situations, and if the cable is fraying or torn, well, there’s your problem. If you have damaged the USB cable try a new one and it will surely work.
There’s another point that should be noted that many times iPhone doesn’t support a cheap/3rdparty charger or USB cable. So make sure you are using the correct and original charger.
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Check the iPhone Charging Port Obstructions:

One of the primary reasons an iPhone won’t charge is remarkably simple; the port on the iPhone is clogged with dust, debris, pocket lint, or some other obstruction. Something quite small can easily prevent a charging cable from fitting properly into the iPhone, so the very first thing you should do is check the charging port on the iPhone and look for any crud or build-up in there. See some lint or some other wad of gremlin or crud? Get it out of there, preferably with something like a Q-Tip, toothpick, or a dry toothbrush. If you have a can of air, blowing it in there can help too.
See some lint or some other wad of gremlin or crud? Get it out of there, preferably with something with a toothpick, or a dry toothbrush. If you have a can of air, blowing it in there can help too. If this is the reason then it will be solved.
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Reboot the iPhone:

You must be wonder how can just a simple rebooting an iPhone can help to solve charging problem. Yes! it can sometimes a simple reboot can resolve a software issue that basically refuses to acknowledge the device is charging. This is somewhat rare, but it can happen.
So if you’ve tried all of the above and the iPhone battery is still not charging at all, force reboot the iPhone by holding down the Power button and Home button until you see the Apple logo, it may help. In several cases, this procedure helped to solve this charging problem.
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The iPhone Was Damaged and Won’t Charge:

I am sorry! but this is the worst case that can happen, anyhow you damaged your iPhone and so it won’t take up charge. If the iPhone has been severely damaged, it often won’t charge. Usually, a simple screen crack won’t make a difference, but if you had your iPhone under a moving car or you threw it from a 50 story building, it’s probably toasted up and won’t charge because the hardware is damaged.
Another reason for charging and power problems is water contact, or dropping an iPhone into liquid and not drying it out properly. If the iPhone has sustained excessive water damage and was not dried out properly and sufficiently, the iPhone battery is often destroyed, and other electrical components in the iPhone can also be damaged as well, which will completely prevent the iPhone from charging.
So this was the few most common reasons why your iPhone won’t get charged up. Check if you guys have any of this in common and see if it is solvable.