Q:"When I connect my iPhone to the charger, it vibrates and says something like iPhone charger accessory may not be supported. I have tried another original Apple cable, but the result is the same. Could you tell me how to fix it? Any help would be greatly appreciated!" - Grace from AT & T Forum
Basically, it is not exactly a complicated problem. In most case, it is merely a minor issue caused by charging cable. But sometimes, the reasons for the problem may be far more than that. If you come up against the same warning prompt while charging your iPhone, then you do not need to go anywhere and just read on this article that has set forth why this occurs and how to put it right.