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That warning is "usually" from a 3rd party lightning cable that doesn't quite meet spec. Apple cables won't give that warning.

It can also occur if the Lightning PORT on the device is wearing out or is dirty, even when using a new Apple cable & charger. Lightning ports do wear out (mine is on its way out) but that usually starts showing symptoms after about 4000 to 5000 cable insertions.
 
Yeah, if you're using a third party cable, consider replacing it with an Apple cable. If it charges your device, charge at your own risk.
 
Yeah, if you're using a third party cable, consider replacing it with an Apple cable. If it charges your device, charge at your own risk.

No, this is the Apple cable. This cable working with other iPhones as charm but with mine can't working properly.
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That warning is "usually" from a 3rd party lightning cable that doesn't quite meet spec. Apple cables won't give that warning.

It can also occur if the Lightning PORT on the device is wearing out or is dirty, even when using a new Apple cable & charger. Lightning ports do wear out (mine is on its way out) but that usually starts showing symptoms after about 4000 to 5000 cable insertions.

If it is because of "Lightning PORT" then why this cable working with other iPhones without any problem?
 
If it is because of "Lightning PORT" then why this cable working with other iPhones without any problem?
Because each phone has a different lightning port. If the cable is the same and works on all but one iPhone, the iPhone where the cable doesn't work has a problem. I'm guessing it's a lightning port issue.
 
I'd try cleaning out the port with some compressed air or something thin & pointy like a cocktail stick...you may be amazed how much fluff etc comes out. I thought a previous iPhone was bust as it wouldnt charge then gave it a clean on the advice of someone at work and pulled out load of fluff and it was fine, saved me a trip to the Apple store. I now just give it a clean every so often as a matter of course.
 
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I use a soft toothbrush to clean my electronic ports when in question. I read it here related to AirPods and use one for everything now. (Goes nicely with the charging case).
 
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