What is wrong with my apple charging cord?

I have an iphone 4 and the last couple days my cord only charges my phone for a moment before it says charging is not supported with this accessory. I tried it on an iphone 3gs and the phone said charging is not supported with this accessory again. Does anyone know a fix to this issue or does the cord need to be replaced?

It's old. Replace it

First, is it an official apple charger or a reproduction, second, have you tried plugging it into a different USB port or power source, third, is there any kinks or imperfections in the cord itself, that can cause a power to be routed to the device unevenly and in some cases cause it to short out, happened with one of my iPods before, I would recommend just buying a new one, unless you are a skilled technician there's no fixing it.

Get a new chord on amazon, you can get some cheap ones there. I had the same issue and the new chord fixed it, never had it again since.

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