IPhone charger is not working?

I'm not sure if it is the iPhone chargers are not working or the iPhone is not wroking with the chargers. I have bought three chargers and none of them work. I took out the USB charger or whatever it is called and plugged it into the computer to see if it would charge but it won't. The thing is if I run around for fifteen minutes trying to plug it into different outlets I will finally find one that works but if I take the charger out of the outlet and put it into the same one it won't work anymore. The only charger that I know that will definitley work is a radio I can put it on upstairs. I can't carry around a radio though._. I'm starting to get really freakin desperate right now, help please?

Cords do go bad all the time. Could be the USB portion is probably worn out. Just go buy one. You can buy cheap(er) knockoffs until you can afford a real Apple cord. Best luck.

Maybe there's something wrong with the bit on your phone that it plugs into

Can you give us more info?