Why won't my phone recognize that it's charging?

Whenever I plug my iPhone 4 in to charge, the phone doesn't recognize that the cable is in and will not charge my phone. I've been struggling with this for months and ordered a new charging port made specifically for my AT&T iPhone (meaning, I purchased and received the correct one).

Anyways, I recently re-installed that new charging port, doing everything correctly (I believe), and it still will not charge. I am wondering if it may be my charging cable itself, but I almost doubt it. I will purchase another one of those today, just in case. I almost wonder if it may be the battery connecting cable, too, but I feel as though if that were the case, the phone would still recognize that it is charging, but there would be no charge entering the phone. I could be wrong, but hopefully that is where you guys come in.

If this has been an issue for anyone else that may know what is going on/have fixed this problem, I would greatly appreciate some assistance.