"Charge is not allowed with this accessory" on iPhone 3GS. Charger, cable are ok??.

Hello all,

Since this morning I am experiencing a weird issue with my iPhone 3GS. Using the standard, little square charger and the standard cable, I get said message.

However, using the same cable plugged in the MacBook Pro, the iPhone charges fine.

On the other hand, the charger and cable assembly can charge the iPad, albeit very slowly.

I read about this issue when people upgraded from iOS 4 to 5, and within 5 versions, but never with the 6.1.2 that is currently installed in both the iPhone and iPad.
I do t quite know where the problem lies. Has anyone a hint about this?

Just did. Whatever the order I plug every part in, the iPhone refuses to let it charge.
As well, the external battery that I am using for all USB-powered devices, definitely non-Apple, has no trouble charging the iPhone.

Then, I made smithing quite similar, and plugged the iPhone t the pad charger, and had no issues. I used the same cable. But as soon as. Returned to the normal, cube charger, it refused to charge.

Any idea?